
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 urging the United States to lead a global effort to halt and reverse the nuclear arms race.
Sponsor Edward Markey (D). Original cosponsor. 9 cosponsors. S.Res. 323 on Congress.gov
Introduced
A concurrent resolution recognizing a health and safety emergency disproportionately affecting the fundamental rights of children due to the Trump administration's directives that unleash fossil fuels and greenhouse gas emissions that contribute to climate change, while suppressing climate change science.
Sponsor Jeff Merkley (D). Original cosponsor. 12 cosponsors. S.Con.Res. 18 on Congress.gov(opens in a new tab)
Introduced
Access to Birth Control Act
Sponsor Cory Booker (D). Original cosponsor. 25 cosponsors. S. 2302 on Congress.gov(opens in a new tab)
Introduced
A bill to amend section 2112 of title 44, United States Code, to appropriately limit donations to Presidential Libraries and Centers.
Sponsor Elizabeth Warren (D). Original cosponsor. 15 cosponsors. S. 2300 on Congress.gov(opens in a new tab)
Introduced
Asunción Valdivia Heat Illness, Injury, and Fatality Prevention Act of 2025
Sponsor Alex Padilla (D). Original cosponsor. 27 cosponsors. S. 2298 on Congress.gov(opens in a new tab)
Introduced
A resolution expressing support for the designation of the month of June 2025 as "National Post-Traumatic Stress Awareness Month" and June 27, 2025, as "National Post-Traumatic Stress Awareness Day".
Sponsor Dan Sullivan (R). Original cosponsor. 18 cosponsors. S.Res. 322 on Congress.gov(opens in a new tab)
Passed the Senate
This resolution designates June 2025 as National Post-Traumatic Stress Awareness Month and June 27, 2025, as National Post-Traumatic Stress Awareness Day. The resolution also supports the efforts of the Department of Veterans Affairs (VA), Department of Defense (DOD), and the medical community to educate people about the causes, symptoms, and treatment of post-traumatic stress. Additionally, it supports efforts by the VA and DOD to foster cultural change around post-traumatic stress.
A resolution designating July 2025 as "Plastic Pollution Action Month".
Sponsor Jeff Merkley (D). Original cosponsor. 5 cosponsors. S.Res. 320 on Congress.gov(opens in a new tab)
Introduced
This resolution designates July 2025 as Plastic Pollution Action Month.
A resolution recognizing that climate change poses a growing threat to public health and necessitates coordinated action to mitigate its impacts and safeguard the health and well-being of all people in the United States.
Sponsor Edward Markey (D). Original cosponsor. 4 cosponsors. S.Res. 318 on Congress.gov(opens in a new tab)
Introduced
A concurrent resolution recognizing the significance of equal pay and the disparity in wages paid to men and to Black women.
Sponsor Lisa Blunt Rochester (D). Original cosponsor. 32 cosponsors. S.Con.Res. 16 on Congress.gov(opens in a new tab)
Introduced
GLOBE Act of 2025
Sponsor Edward Markey (D). Original cosponsor. 20 cosponsors. S. 2231 on Congress.gov(opens in a new tab)
Introduced
United States Foreign Service Commemorative Coin Act
Sponsor Dan Sullivan (R). Original cosponsor. 16 cosponsors. S. 2229 on Congress.gov(opens in a new tab)
Introduced
A resolution expressing support for the designation of July 10, 2025, as Journeyman Lineworkers Recognition Day.
Sponsor Catherine Cortez Masto (D). Original cosponsor. 22 cosponsors. S.Res. 315 on Congress.gov(opens in a new tab)
Passed the Senate
VISIBLE Act
Sponsor Alex Padilla (D). Original cosponsor. 23 cosponsors. S. 2212 on Congress.gov(opens in a new tab)
Introduced
A resolution recognizing June 2025, as "LGBTQ Pride Month".
Sponsor Tina Smith (D). Original cosponsor. 45 cosponsors. S.Res. 312 on Congress.gov(opens in a new tab)
Introduced
This resolution expresses support for the rights, freedoms, and equal treatment of lesbian, gay, bisexual, transgender, and queer (LGBTQ) individuals.
The resolution recognizes that LGBTQ rights are human rights and protected by the laws of the United States and international treaties.
Additionally, the resolution encourages the celebration of LGBTQ Pride Month in June.
Protecting America’s Diplomatic Workforce Act
Sponsor Jeanne Shaheen (D). Original cosponsor. 9 cosponsors. S. 2204 on Congress.gov(opens in a new tab)
Introduced
A resolution expressing support for the designation of June 26 as "LGBTQI+ Equality Day".
Sponsor Tammy Baldwin (D). Original cosponsor. 25 cosponsors. S.Res. 306 on Congress.gov(opens in a new tab)
Introduced
This resolution expresses support for (1) equal rights and protections for all people, regardless of actual or perceived sexual orientation, gender identity, or sex characteristics; and (2) the designation of LGBTQI+ Equality Day to commemorate Supreme Court decisions handed down on June 26 in 2003, 2013, and 2015.
The resolution also acknowledges the need for further legislation to ensure that people in the United States are free from all forms of discrimination on the basis of actual or perceived sexual orientation, gender identity, or sex characteristics.
Credit for Caring Act of 2025
Sponsor Shelley Capito (R). Joined Jun 26, 2025. 11 cosponsors. S. 925 on Congress.gov(opens in a new tab)
Introduced
Refund Equality Act of 2025
Sponsor Elizabeth Warren (D). Original cosponsor. 46 cosponsors. S. 2197 on Congress.gov(opens in a new tab)
Introduced
Global Respect Act of 2025
Sponsor Jeanne Shaheen (D). Original cosponsor. 14 cosponsors. S. 2180 on Congress.gov(opens in a new tab)
Introduced
Canyon’s Law
Sponsor Jeff Merkley (D). Original cosponsor. 9 cosponsors. S. 2179 on Congress.gov(opens in a new tab)
Introduced
Equal Dignity for Married Taxpayers Act of 2025
Sponsor Ron Wyden (D). Original cosponsor. 44 cosponsors. S. 2178 on Congress.gov(opens in a new tab)
Introduced
Honoring Our Fallen Heroes Act of 2025
Sponsor Amy Klobuchar (D). Joined Jun 25, 2025. 59 cosponsors. S. 237 on Congress.gov(opens in a new tab)
Passed committee
Honoring Our Fallen Heroes Act of 2025
This bill extends death and disability benefits under the Public Safety Officers' Benefits Program (PSOB) to certain public safety officers who suffer from exposure-related cancer while on duty and their survivors. The PSOB program provides death, disability, and education benefits to public safety officers who are killed or injured in the line of duty and their survivors.
The bill specifies that exposure to a carcinogen shall be presumed to constitute a personal injury in the line of duty if
• the exposure occurred while the officer was in the line of duty;
• the officer began serving as an officer not fewer than 5 years before the date of the diagnosis of an exposure-related cancer and the diagnosis occurred not more than 15 years after the last date of active service; and
• the exposure-related cancer directly and proximately resulted in the death or permanent and total disability of the officer.
The Department of Justice's Bureau of Justice Assistance must periodically review the definition of exposure-related cancer and update the definition if appropriate based on medical evidence and in accordance with the requirements of a petition process.
Head Start for Our Future Act
Sponsor Kirsten Gillibrand (D). Original cosponsor. 11 cosponsors. S. 2166 on Congress.gov(opens in a new tab)
Introduced
3D Printed Gun Safety Act of 2025
Sponsor Edward Markey (D). Original cosponsor. 23 cosponsors. S. 2165 on Congress.gov(opens in a new tab)
Introduced
3D Printed Gun Safety Act of 2025
This bill makes it unlawful to intentionally publish digital instructions that can automatically program a three-dimensional printer or similar device to produce or complete a firearm from an unfinished frame or receiver.
Keeping Gun Dealers Honest Act of 2025
Sponsor Edward Markey (D). Original cosponsor. 13 cosponsors. S. 2155 on Congress.gov(opens in a new tab)
Introduced
Keeping Gun Dealers Honest Act of 2025
This bill broadens the authority of the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) to administer federal laws governing the licensing, inspection, and enforcement of federally licensed dealers, importers, and manufacturers of firearms (federal firearms licensees, or FFLs). The bill also increases criminal penalties for FFLs and licensed collectors who commit certain recordkeeping violations.
With respect to licensing, the bill allows the ATF to deny an application for a federal firearms license if it would endanger public safety or if the applicant is unlikely to comply with the law.
Additionally, the bill enhances the ATF's inspection authority, including by increasing the maximum number of annual compliance inspections to three (currently, one) and by authorizing an additional 80 personnel to conduct inspections.
The bill also expands the ATF's enforcement authority, including by allowing it to suspend the license of or impose a civil penalty on an FFL who violates federal firearms laws or regulations and by allowing it to require an FFL to conduct physical inventories if the FFL unlawfully transfers a firearm or if 10 or more firearms used in a crime are traced back to the FFL.
Finally, the bill increases the maximum prison term to five years (currently, one year) for an FFL or licensed collector who knowingly makes a false statement or representation in required firearms records.