Mike Lee

Senator · UT · R

Current term Jan 3, 2023 – Jan 3, 2029 · In the Senate since Jan 5, 2011

Official website Contact form Biographical Directory

Portrait: U.S. Government Publishing Office, via unitedstates/images (public domain)

Working relationships

How often this member works with colleagues across party lines, from bill sponsorships and recorded votes in this Congress. Bills are H.R., S., H.J.Res. and S.J.Res.; resolutions, post office namings, and Congressional Gold Medal and commemorative coin bills are left out. Independents are counted with the party they caucus with. These figures describe the public record; they do not measure effectiveness or ideology.

Mike Lee · ChamberLens.org

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Mike Lee

Senator · UT · R

Current term Jan 3, 2023 – Jan 3, 2029 · In the Senate since Jan 5, 2011

Official website Contact form Biographical Directory

Portrait: U.S. Government Publishing Office, via unitedstates/images (public domain)

Working relationships

119th Congress, Senate.

Bills with other-party backing

11 of 130 bills they sponsored had at least one original cosponsor from the other party.

Senate median 41% · Republicans 43%

Cosponsoring the other party's bills

10%

19 of 198 bills they cosponsored were introduced by a Democrat.

Senate median 19% · Republicans 18%

Voting with own party

99%

On 813 party-line votes, voted with most Republicans 808 times.

Senate median 99% · Republicans >99%

Voting with the other party

On 865 contested votes, voted the same way as most Democrats 41 times.

Senate median 6% · Republicans 6%

Closest collaborators

Counted both ways: bills by the colleague that this member cosponsored, and bills by this member that the colleague cosponsored.

All colleagues

Ted CruzRTX20 of theirs · 18 of this member's
John R. CurtisRUT7 of theirs · 25 of this member's
Rick ScottRFL10 of theirs · 19 of this member's
Marsha BlackburnRTN10 of theirs · 16 of this member's
Cynthia M. LummisRWY6 of theirs · 18 of this member's
Rand PaulRKY9 of theirs · 9 of this member's
James LankfordROK8 of theirs · 8 of this member's
John BarrassoRWY7 of theirs · 9 of this member's
Bill HagertyRTN8 of theirs · 7 of this member's
James E. RischRID8 of theirs · 7 of this member's

Across the aisle (Democrats)

Richard J. DurbinDIL4 of theirs · 4 of this member's
Cory A. BookerDNJ1 of theirs · 5 of this member's
Margaret Wood HassanDNH2 of theirs · 2 of this member's
Ron WydenDOR2 of theirs · 2 of this member's
Christopher A. CoonsDDE1 of theirs · 3 of this member's
Amy KlobucharDMN

Voting most alike

Contested roll calls (at least 10% of yea and nay votes on the losing side) on which both voted yea or nay, and how often they made the same choice. Colleagues who shared too few of these votes with this member are not ranked.

Most alike

Ron JohnsonRWI99% · 850 of 859
Ted CruzRTX99% · 808 of 820
Rick ScottRFL98% · 850 of 864
Bernie MorenoROH98% · 846 of 861
Cynthia M. LummisRWY98% · 822 of 838

Bipartisan bills that advanced

Bills this member sponsored or joined as an original cosponsor, with original backers from both parties, that passed at least one chamber (3). Furthest along first.

Passed the SenateS. 1837DEFIANCE Act of 2025
Original cosponsor · sponsored by Richard J. Durbin · original backers: 6 D, 3 R · passed the Senate Jan 13, 2026
Passed the SenateS. 3021ENFORCE Act
Original cosponsor · sponsored by John Cornyn · original backers: 1 D, 3 R · passed the Senate Dec 16, 2025
Passed the SenateS. 960Justice for Murder Victims Act
Original cosponsor · sponsored by Chuck Grassley · original backers: 1 D, 2 R · passed the Senate Mar 11, 2025

Each member's party on each date comes from congress-legislators term records. Party-line votes are roll calls on which most voting Democrats and most voting Republicans took opposite sides; procedural votes are included. The Vice President's tie-breaking votes and impeachment verdicts are not counted, and a bill enacted as part of another bill counts only at the stage it reached on its own. Medians include everyone who served in the chamber this Congress with enough records (5 sponsored bills, 10 cosponsorships, 25 votes). Computed Oct 23, 2026, 5:50 AM ET from Congress.gov and House and Senate roll calls.

119th Congress, Senate.

Bills with other-party backing

11 of 130 bills they sponsored had at least one original cosponsor from the other party.

Senate median 41% · Republicans 43%

Cosponsoring the other party's bills

10%

19 of 198 bills they cosponsored were introduced by a Democrat.

Senate median 19% · Republicans 18%

Voting with own party

99%

On 813 party-line votes, voted with most Republicans 808 times.

Senate median 99% · Republicans >99%

Voting with the other party

On 865 contested votes, voted the same way as most Democrats 41 times.

Senate median 6% · Republicans 6%

Closest collaborators

Counted both ways: bills by the colleague that this member cosponsored, and bills by this member that the colleague cosponsored.

All colleagues

Ted CruzRTX20 of theirs · 18 of this member's
John R. CurtisRUT7 of theirs · 25 of this member's
Rick ScottRFL10 of theirs · 19 of this member's
Marsha BlackburnRTN10 of theirs · 16 of this member's
Cynthia M. LummisRWY6 of theirs · 18 of this member's
Rand PaulRKY9 of theirs · 9 of this member's
James LankfordROK8 of theirs · 8 of this member's
John BarrassoRWY7 of theirs · 9 of this member's
Bill HagertyRTN8 of theirs · 7 of this member's
James E. RischRID8 of theirs · 7 of this member's

Across the aisle (Democrats)

Richard J. DurbinDIL4 of theirs · 4 of this member's
Cory A. BookerDNJ1 of theirs · 5 of this member's
Margaret Wood HassanDNH2 of theirs · 2 of this member's
Ron WydenDOR2 of theirs · 2 of this member's
Christopher A. CoonsDDE1 of theirs · 3 of this member's
Amy KlobucharDMN

Voting most alike

Most alike

Ron JohnsonRWI99% · 850 of 859
Ted CruzRTX99% · 808 of 820
Rick ScottRFL98% · 850 of 864
Bernie MorenoROH98% · 846 of 861
Cynthia M. LummisRWY98% · 822 of 838

Bipartisan bills that advanced

Bills this member sponsored or joined as an original cosponsor, with original backers from both parties, that passed at least one chamber (3). Furthest along first.

Passed the SenateS. 1837DEFIANCE Act of 2025
Original cosponsor · sponsored by Richard J. Durbin · original backers: 6 D, 3 R · passed the Senate Jan 13, 2026
Passed the SenateS. 3021ENFORCE Act
Original cosponsor · sponsored by John Cornyn · original backers: 1 D, 3 R · passed the Senate Dec 16, 2025
Passed the SenateS. 960Justice for Murder Victims Act
Original cosponsor · sponsored by Chuck Grassley · original backers: 1 D, 2 R · passed the Senate Mar 11, 2025

Mike Lee

Working relationships

Mike Lee

Working relationships

Closest collaborators

All colleagues

Across the aisle (Democrats)

Voting most alike

Most alike

Bipartisan bills that advanced

Closest collaborators

All colleagues

Across the aisle (Democrats)

Voting most alike

Most alike

Bipartisan bills that advanced

Most alike among Democrats