
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.
Saving the OOI Act of 2026
Sponsor Lisa Murkowski (R). Original cosponsor. 11 cosponsors. S. 4822 on Congress.gov
Passed the Senate
Saving the OOI Act of 2026
This bill prohibits the National Science Foundation (NSF) from using federal funds to decommission or descope Ocean Observatories Initiative (OOI) instruments until a thorough review of OOI is completed.
OOI measures and observes ocean conditions using a series of in-water instruments that gather physical, chemical, geological, and biological data. On May 21, 2026, NSF announced that it would remove all in-water infrastructure from four of the five active OOI arrays.
Under the bill, NSF must conduct a thorough review of OOI with engagement from the scientific and coastal communities before decommissioning or descoping specified OOI instruments. This includes OOI instruments anchored off of Oregon, Washington, Alaska, and North Carolina, as well as instruments anchored in the Irminger Sea. NSF is required to maintain full and consistent OOI operations, including monitoring in states where instruments have already been decommissioned, until the review is complete.
A bill to require the Secretary of Homeland Security to designate Haiti for temporary protected status.
Sponsor Edward Markey (D). Original cosponsor. 46 cosponsors. S. 4814 on Congress.gov(opens in a new tab)
Introduced
Land of the Free Act of 2026
Sponsor Alex Padilla (D). Original cosponsor. 11 cosponsors. S. 4800 on Congress.gov(opens in a new tab)
Introduced
Stock Buyback Accountability Act of 2026
Sponsor Charles Schumer (D). Original cosponsor. 7 cosponsors. S. 4796 on Congress.gov(opens in a new tab)
Introduced
A bill to abolish the Anti-Weaponization Fund, and for other purposes.
Sponsor Charles Schumer (D). Original cosponsor. 25 cosponsors. S. 4791 on Congress.gov(opens in a new tab)
Introduced
Make More in America Act of 2026
Sponsor Charles Schumer (D). Original cosponsor. 12 cosponsors. S. 4781 on Congress.gov(opens in a new tab)
Introduced
Child Safety and Well-Being Act of 2026
Sponsor Edward Markey (D). Original cosponsor. 4 cosponsors. S. 4763 on Congress.gov(opens in a new tab)
Introduced
ADAPT Act
Sponsor John Barrasso (R). Joined Jun 11, 2026. 3 cosponsors. S. 2356 on Congress.gov(opens in a new tab)
Introduced
Accelerating the Development of Advanced Psychology Trainees Act or the ADAPT Act
This bill provides for Medicare coverage of services that are furnished by advanced psychology trainees. It also requires the Centers for Medicare & Medicaid Services to issue guidance for states on coverage options for such services under Medicaid and the Children's Health Insurance Program (CHIP).
A joint resolution providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Centers for Medicare & Medicaid Services of the Department of Health and Human Services relating to "Medicare Program; Implementation of Prior Authorization for Select Services for the Wasteful and Inappropriate Services Reduction (WISeR) Model".
Sponsor Ron Wyden (D). Joined Jun 9, 2026. 20 cosponsors. S.J.Res. 192 on Congress.gov(opens in a new tab)
Passed committee
Artificial Intelligence Environmental Impacts Act of 2026
Sponsor Edward Markey (D). Original cosponsor. 4 cosponsors. S. 4727 on Congress.gov(opens in a new tab)
Introduced
State Department Integrity and Transparency Act
Sponsor Timothy Kaine (D). Original cosponsor. 3 cosponsors. S. 4719 on Congress.gov(opens in a new tab)
Introduced
A resolution expressing support for the designation of June 5, 2026, as "National Gun Violence Awareness Day" and June 2026 as "National Gun Violence Awareness Month".
Sponsor Richard Durbin (D). Original cosponsor. 13 cosponsors. S.Res. 756 on Congress.gov(opens in a new tab)
Introduced
Freedom to Travel for Health Care Act of 2026
Sponsor Catherine Cortez Masto (D). Original cosponsor. 35 cosponsors. S. 4701 on Congress.gov(opens in a new tab)
Introduced
Freedom to Travel for Health Care Act of 2026
This bill prohibits anyone from interfering with a person's ability to access out-of-state reproductive health care. (Reproductive health care is defined as medical, surgical, counseling, or referral services and care related to pregnancy, including the prevention or termination of a pregnancy, and other reproductive care.)
Specifically, the bill prohibits anyone from restricting, discriminating against, or otherwise disadvantaging anyone who receives, provides, or assists with out-of-state reproductive health care that is legal in the state in which it is provided.
The bill allows the Department of Justice to bring a civil action and establishes a private right of action for violations. The bill specifically waives any applicable governmental immunity and preempts any contravening state laws.
Complete America’s Great Trails Act
Sponsor Richard Blumenthal (D). Original cosponsor. 3 cosponsors. S. 4700 on Congress.gov(opens in a new tab)
Introduced
Encouraging Public Offerings Act of 2026
Sponsor Ted Budd (R). Original cosponsor. 5 cosponsors. S. 4690 on Congress.gov(opens in a new tab)
Introduced
Protecting American Consumers Act
Sponsor Elizabeth Warren (D). Original cosponsor. 16 cosponsors. S. 4684 on Congress.gov(opens in a new tab)
Introduced
Investing in the American Dream Act
Sponsor Edward Markey (D). Joined Jun 4, 2026. 23 cosponsors. S. 4411 on Congress.gov(opens in a new tab)
Introduced
ASAP Act
Sponsor Susan Collins (R). Joined Jun 2, 2026. 57 cosponsors. S. 3267 on Congress.gov(opens in a new tab)
Introduced
Alzheimer's Screening and Prevention Act or the ASAP Act
This bill provides for Medicare coverage of blood tests to screen for the early stages of Alzheimer’s disease or related dementias. Specifically, the bill provides for coverage of genomic sequencing blood or blood product tests, or other equivalent tests, that are approved by the Food and Drug Administration.
A resolution honoring the life of the Honorable Donald W. Riegle, Jr., former Senator for the State of Michigan.
Sponsor Gary Peters (D). Original cosponsor. 99 cosponsors. S.Res. 755 on Congress.gov(opens in a new tab)
Passed the Senate
This resolution honors the life of Donald W. Riegle, Jr., former Senator for the state of Michigan, and expresses condolences to his family and loved ones.
A concurrent resolution recognizing the importance of saving lives, reducing gun violence, and strengthening public safety as the United States celebrates its 250th anniversary.
Sponsor Angela Alsobrooks (D). Original cosponsor. 6 cosponsors. S.Con.Res. 34 on Congress.gov(opens in a new tab)
Introduced
A resolution expressing the sense of the Senate to reduce traffic fatalities to zero by 2050.
Sponsor Richard Blumenthal (D). Original cosponsor. 7 cosponsors. S.Res. 753 on Congress.gov(opens in a new tab)
Introduced
SAFE for Survivors Act of 2026
Sponsor Patty Murray (D). Original cosponsor. 10 cosponsors. S. 4635 on Congress.gov(opens in a new tab)
Introduced
Elementary and Secondary School Counseling Act
Sponsor Jeff Merkley (D). Original cosponsor. 19 cosponsors. S. 4618 on Congress.gov(opens in a new tab)
Introduced
Elementary and Secondary School Counseling Act
This bill directs the Department of Education to award formula grants to states and, through them, subgrants to local educational agencies to increase access to school-based, mental-health-services providers at high-need public elementary and secondary schools.
Federal Death Penalty Prohibition Act
Sponsor Richard Durbin (D). Original cosponsor. 17 cosponsors. S. 4608 on Congress.gov(opens in a new tab)
Introduced
Taxing Buybacks from Big Oil Windfalls Act
Sponsor Ron Wyden (D). Original cosponsor. 16 cosponsors. S. 4588 on Congress.gov(opens in a new tab)
Introduced