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How did Markwayne Mullin vote on Environmental Protection?

Markwayne Mullin voted Yea on 12 and Nay on 4 of the 19 Environmental Protection roll calls in the Senate in the 119th Congress, as of Nov 2, 2026.

On the 15 of those where most Democrats and most Republicans voted on opposite sides, he voted with Republicans 100% of the time (median for Senate Republicans: 100%).

Environmental Protection votes
Yea	12
Nay	4
Did not vote	0
Environmental Protection roll calls in the Senate	19
With Republicans on party-line votes	15 of 15 (100%)
Senate Republicans, median	100%

Source: Voteview roll calls (UCLA) · policy area of each bill from congress.gov · How we measure · Updated Nov 2, 2026

The 10 most recent of 16 Environmental Protection votes

Date	Measure	Title	Vote	Result
Jan 7, 2026	S.J.Res. 86	A joint resolution providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "Air Plan Approval; South Dakota; Regional Haze Plan for the Second Implementation Period".On the Motion to Proceed · This joint resolution nullifies the Environmental Protection Agency (EPA) final rule titled Air Plan Approval; South Dakota; Regional Haze…	Nay	Failed 43–50
Nov 19, 2025	S.J.Res. 76	A joint resolution providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "Extension of Deadlines in Standards of Performance for New, Reconstructed, and Modified Sources and Emissions Guidelines for Existing Sources: Oil and Natural Gas Sector Climate Review Final Rule".On the Motion to Proceed · This joint resolution nullifies the rule issued by Environmental Protection Agency titled Extension of Deadlines in Standards of…	Nay	Failed 46–51
Oct 29, 2025	S.J.Res. 69	A joint resolution providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the United States Fish and Wildlife Service relating to "Record of Decision for the Barred Owl Management Strategy; Washington, Oregon, and California".On the Motion to Proceed	Nay	Failed 25–72
Sep 16, 2025	S.J.Res. 60	A joint resolution providing for congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "Emissions Budget and Allowance Allocations for Indiana Under the Revised Cross-State Air Pollution Rule Update".On the Motion to Proceed · This joint resolution nullifies the Environmental Protection Agency interim final rule titled Emissions Budget and Allowance Allocations…	Nay	Failed 47–51
May 22, 2025	H.J.Res. 89	Providing congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "California State Motor Vehicle and Engine and Nonroad Engine Pollution Control Standards; The 'Omnibus' Low NOX Regulation; Waiver of Preemption; Notice of Decision".On the Joint Resolution · This joint resolution revokes the waiver granted to the California Air Resources Board regarding new emissions standards for new 2024 and…	Yea	Passed 49–46
May 22, 2025	H.J.Res. 89	Providing congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "California State Motor Vehicle and Engine and Nonroad Engine Pollution Control Standards; The 'Omnibus' Low NOX Regulation; Waiver of Preemption; Notice of Decision".On the Motion to Proceed · This joint resolution revokes the waiver granted to the California Air Resources Board regarding new emissions standards for new 2024 and…	Yea	Passed 51–46
May 22, 2025	H.J.Res. 87	Providing congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "California State Motor Vehicle and Engine Pollution Control Standards; Heavy-Duty Vehicle and Engine Emission Warranty and Maintenance Provisions; Advanced Clean Trucks; Zero Emission Airport Shuttle; Zero-Emission Power Train Certification; Waiver of Preemption; Notice of Decision".On the Joint Resolution · This joint resolution revokes waivers granted to the California Air Resources Board regarding several of its regulations, including the…	Yea	Passed 51–45
May 22, 2025	H.J.Res. 87	Providing congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "California State Motor Vehicle and Engine Pollution Control Standards; Heavy-Duty Vehicle and Engine Emission Warranty and Maintenance Provisions; Advanced Clean Trucks; Zero Emission Airport Shuttle; Zero-Emission Power Train Certification; Waiver of Preemption; Notice of Decision".On the Motion to Proceed · This joint resolution revokes waivers granted to the California Air Resources Board regarding several of its regulations, including the…	Yea	Passed 51–46
May 22, 2025	H.J.Res. 88	Providing congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "California State Motor Vehicle and Engine Pollution Control Standards; Advanced Clean Cars II; Waiver of Preemption; Notice of Decision".On the Joint Resolution · This joint resolution revokes the waiver granted to the California Air Resources Board regarding its Advanced Clean Cars II (ACC II)…	Yea	Passed 51–44
May 21, 2025	H.J.Res. 88	Providing congressional disapproval under chapter 8 of title 5, United States Code, of the rule submitted by the Environmental Protection Agency relating to "California State Motor Vehicle and Engine Pollution Control Standards; Advanced Clean Cars II; Waiver of Preemption; Notice of Decision".On the Motion to Proceed · This joint resolution revokes the waiver granted to the California Air Resources Board regarding its Advanced Clean Cars II (ACC II)…	Yea	Passed 51–46

All 16 are in the full voting record, part of Pro.