
U.S. Senator for Maryland
Democrat
Senate term end not loaded yet
Missed 1.5% of roll calls. Chamber median 2.1%.
The full voting recordCounts roll calls where most Democrats and most Republicans voted differently, leaving out procedural votes.
How we countFrom FEC filings, Voteview roll calls and Congress.gov.
Democrat. In Congress since 2003, 9 terms in total.
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Bills and resolutions Van Hollen signed on to as a cosponsor. An original cosponsor signed on the day the bill was introduced. Source: govinfo bill status files, last updated Nov 6, 2026.
Van Hollen also withdrew as a cosponsor from 2 bills, not listed here.
A resolution recognizing the important work of the United States Preventive Services Task Force.
Sponsor Angus King (I). Original cosponsor. 9 cosponsors. S.Res. 343 on Congress.gov
Introduced
Restoring Essential Healthcare Act
Sponsor Tina Smith (D). Original cosponsor. 30 cosponsors. S. 2524 on Congress.gov(opens in a new tab)
Introduced
John R. Lewis Voting Rights Advancement Act of 2025
Sponsor Richard Durbin (D). Original cosponsor. 46 cosponsors. S. 2523 on Congress.gov(opens in a new tab)
Introduced
John R. Lewis Voting Rights Advancement Act of 2025
This bill establishes new criteria for determining which states and political subdivisions must obtain preclearance before changes to voting practices may take effect. Preclearance is the process of receiving preapproval from the Department of Justice (DOJ) or the U.S. District Court for the District of Columbia before making legal changes that would affect voting rights.
A state and all of its political subdivisions shall be subject to preclearance of voting practice changes for a 10-year period if, during the previous 25 years:
• 15 or more voting rights violations occurred in the state; or
• 10 or more violations occurred, at least 1 of which was committed by the state itself.
A political subdivision as a separate unit shall also be subject to preclearance for a 10-year period if three or more voting rights violations occurred there during the previous 25 years.
States and political subdivisions that meet certain thresholds regarding minority groups must preclear covered practices before implementation, such as redistricting.
States and political subdivisions must notify the public of changes to voting practices.
The bill authorizes DOJ to require states or political subdivisions to provide certain documents or answers to questions for enforcing voting rights.
The bill outlines factors courts must consider when hearing challenges to voting practices, such as the extent of any history of official voting discrimination in the state or political subdivision.
The bill also includes certain protections for election workers, polling places, and election infrastructure.
All Aboard Act of 2025
Sponsor Edward Markey (D). Original cosponsor. 10 cosponsors. S. 2520 on Congress.gov(opens in a new tab)
Introduced
Gun Violence Prevention Research Act of 2025
Sponsor Edward Markey (D). Original cosponsor. 32 cosponsors. S. 2514 on Congress.gov(opens in a new tab)
Introduced
College Transparency Act
Sponsor Bill Cassidy (R). Original cosponsor. 26 cosponsors. S. 2511 on Congress.gov(opens in a new tab)
Passed committee
College Transparency Act
This bill requires the National Center for Education Statistics (NCES) to establish a secure and privacy-protected data system that contains information about postsecondary students.
Specifically, the data system must
• evaluate student enrollment patterns, progression, completion, and postcollegiate outcomes, and higher education costs and financial aid;
• provide complete and customizable information for students and families making decisions about postsecondary education;
• reduce the requirements for reporting by institutions of higher education; and
• periodically match with other federal systems of data.
The bill also establishes a postsecondary student data system advisory committee.
The Department of Education (ED) and NCES must (1) provide dedicated and adequate staffing at ED to implement the bill's requirements, and (2) report to Congress on a quarterly basis regarding the progress of implementing the bill's requirements.
Research for Healthy Soils Act
Sponsor Jeff Merkley (D). Original cosponsor. 4 cosponsors. S. 2500 on Congress.gov(opens in a new tab)
Introduced
Research for Healthy Soils Act
This bill includes research on the agricultural impacts of microplastics in land-applied biosolids on farmland as a Department of Agriculture (USDA) high-priority research and extension area and reauthorizes other research and extension activities. Microplastic is a plastic or plastic-coated particle that is less than 5 millimeters in size.
The bill specifically allows grants for carrying out or enhancing research on microplastics (e.g., through the development or analysis of wastewater treatment techniques to filter out or biodegrade microplastics from biosolids intended to be used for agricultural purposes).
Further, the bill reauthorizes USDA grants to support competitive specialized research and extension activities, including high-priority areas, through FY2031. The bill also specifically reauthorizes through FY2031
• the Pulse Crop Health Initiative;
• the Comprehensive Food Safety Training Network;
• pollinator protection research and extension grants;
• increased USDA capacity and infrastructure to address and conduct research on colony collapse disorder and other pollinator issues; and
• a USDA-conducted nationwide honey bee pest, pathogen, health, and population status surveillance program.
Safe Operations of Shared Airspace Act of 2025
Sponsor Maria Cantwell (D). Joined Jul 28, 2025. 13 cosponsors. S. 1985 on Congress.gov(opens in a new tab)
Introduced
Safe Operations of Shared Airspace Act of 2025
This bill addresses aviation safety, such as through increasing requirements for aircraft tracking, communication, and coordination with the military. The bill also addresses Federal Aviation Administration (FAA) workforce issues.
For example, the bill revises and increases requirements for using Automatic Dependent Surveillance-Broadcast (ADS-B) equipment, which transmits information (e.g., location and weather information) between aircraft and air traffic control.
Under the bill, aircraft must generally operate with ADS-B In (receiving) equipment. The FAA must issue performance requirements for the equipment to provide safety-enhancing capabilities (e.g., facilitating aircraft collision avoidance) for flight crews.
Further, current FAA regulations allow aircraft performing a sensitive government mission to be excepted from requirements for using ADS-B Out (broadcasting) equipment. This bill limits which flights may be considered sensitive government missions (e.g., not training flights).
The FAA must also (1) establish an office to coordinate airspace usage of military aircraft, (2) review the safety of certain flight operations and routes around airports, and (3) enter into memoranda of understanding with military agencies for safety information sharing.
The FAA must conduct a Transport Airplane Risk Assessment Methodology analysis for any transport airplane accidents in the United States that result in a fatality.
The bill also addresses FAA workforce issues, such as by
• excluding the FAA workforce from a federal hiring freeze, deferred resignation program, voluntary furlough, or reduction in force;
• supporting the recruitment and training of air traffic controllers; and
• requiring strict adherence to federal conflict of interest requirements.
A resolution recognizing the importance of independent living and economic self-sufficiency for individuals with disabilities made possible by the Americans with Disabilities Act of 1990 and calling for further action to strengthen and expand health care for individuals with disabilities to work and live in the community.
Sponsor Tammy Duckworth (D). Original cosponsor. 24 cosponsors. S.Res. 338 on Congress.gov(opens in a new tab)
Introduced
Eviction Right to Counsel Act of 2025
Sponsor Cory Booker (D). Original cosponsor. 4 cosponsors. S. 2463 on Congress.gov(opens in a new tab)
Introduced
Promotion and Expansion of Private Employee Ownership Act of 2025
Sponsor Steve Daines (R). Original cosponsor. 33 cosponsors. S. 2461 on Congress.gov(opens in a new tab)
Introduced
ABLE Employment Flexibility Act
Sponsor Amy Klobuchar (D). Original cosponsor. 4 cosponsors. S. 2459 on Congress.gov(opens in a new tab)
Introduced
End Polluter Welfare Act of 2025
Sponsor Bernie Sanders (I). Original cosponsor. 6 cosponsors. S. 2444 on Congress.gov(opens in a new tab)
Introduced
Stop the Scammers Act
Sponsor Catherine Cortez Masto (D). Original cosponsor. 26 cosponsors. S. 2429 on Congress.gov(opens in a new tab)
Introduced
A concurrent resolution recognizing the need to improve physical access to many federally funded facilities for all people of the United States, particularly people with disabilities.
Sponsor Richard Blumenthal (D). Original cosponsor. 5 cosponsors. S.Con.Res. 19 on Congress.gov(opens in a new tab)
Introduced
ICBM Act
Sponsor Edward Markey (D). Original cosponsor. 3 cosponsors. S. 2422 on Congress.gov(opens in a new tab)
Introduced
First-Time Homebuyer Tax Credit Act of 2025
Sponsor Sheldon Whitehouse (D). Original cosponsor. 13 cosponsors. S. 2402 on Congress.gov(opens in a new tab)
Introduced
A resolution calling upon the Senate to give its advice and consent to the ratification of the United Nations Convention on the Law of the Sea.
Sponsor Mazie Hirono (D). Original cosponsor. 11 cosponsors. S.Res. 331 on Congress.gov(opens in a new tab)
Introduced
This resolution urges the Senate to give its advice and consent to the ratification of the United Nations Convention on the Law of the Sea. The resolution affirms that it is in the national interest for the United States to become a formal signatory of the convention, and it recommends that this ratification remain a top federal priority.
Preventing Authoritarian Policing Tactics on America’s Streets Act
Sponsor Jeff Merkley (D). Original cosponsor. 10 cosponsors. S. 2386 on Congress.gov(opens in a new tab)
Introduced
SAFEGUARDS Act of 2025
Sponsor Jerry Moran (R). Original cosponsor. 12 cosponsors. S. 2378 on Congress.gov(opens in a new tab)
Passed committee
Spending Aviation Fees for Equipment, Guaranteeing Upgraded and Advanced Risk Detection and Safety Act of 2025 or the SAFEGUARDS Act of 2025
This bill allocates additional funding for the Transportation Security Administration (TSA) for aviation security, including checked baggage explosives detection equipment and security checkpoint technology.
As background, TSA collects passenger civil aviation security service fees (often referred to as the 9/11 security fee or passenger security fee) on air carrier passengers originating at airports in the United States. In general, these fees are deposited into the Department of the Treasury general fund and applied towards debt reduction. A portion of these fees are allocated to TSA for aviation security.
The bill requires that the first $500 million collected in each fiscal year from passenger security fees be deposited into the Aviation Security Capital Fund. This is an increase from the currently required $250 million. This fund provides for the costs associated with acquiring and installing in-line baggage screening systems (i.e., systems that use a conveyor belt infrastructure to automatically screen, sort, and track baggage) to accommodate checked baggage explosives detection equipment and for certain other airport security improvements.
The bill also requires that the next $250 million collected in each fiscal year from passenger security fees be deposited into a new Aviation Security Checkpoint Technology Fund for the costs associated with acquiring, deploying, and sustaining aviation security checkpoint and exit lane technology. TSA may use these funds retroactively for projects implemented on or after January 1, 2023.
EACH Act of 2025
Sponsor Tammy Duckworth (D). Original cosponsor. 34 cosponsors. S. 2377 on Congress.gov(opens in a new tab)
Introduced
Jordan McNair Student Athlete Heat Fatality Prevention Act
Sponsor Angela Alsobrooks (D). Original cosponsor. 1 cosponsor. S. 2373 on Congress.gov(opens in a new tab)
Introduced
Protect DREAMer Confidentiality Act of 2025
Sponsor Martin Heinrich (D). Original cosponsor. 28 cosponsors. S. 2350 on Congress.gov(opens in a new tab)
Introduced
BRAIN Act
Sponsor Richard Blumenthal (D). Joined Jul 17, 2025. 14 cosponsors. S. 1330 on Congress.gov(opens in a new tab)
Introduced
A resolution expressing the sense of the Senate that the actions of the Trump Administration that drastically and indiscriminately reduce staff at Federal agencies, freeze vast swaths of critical Federal funding, and dismantle Federal agencies are destructive and harmful to communities across the United States and have raised costs for American families.
Sponsor Jacky Rosen (D). Original cosponsor. 10 cosponsors. S.Res. 324 on Congress.gov(opens in a new tab)
Introduced