Federal · 119th Congress
DEF Act
Policy areaEnvironmental Protection
The Congressional Research Service has not published a summary of this measure.
Read the text of the bill →Sponsor
Cosponsors7
Jack BergmanRU.S. Representative · 1st District · MI
Donald G. DavisDU.S. Representative · 1st District · NC
Brad FinstadRU.S. Representative · 1st District · MN
Michelle FischbachRU.S. Representative · 7th District · MN
Mike BostRU.S. Representative · 12th District · IL
H. Morgan GriffithRU.S. Representative · 9th District · VA
Michael A. RulliRU.S. Representative · 6th District · OHOther titles3
To amend the Clean Air Act to preserve regulatory stability for motor vehicles, motor vehicle engines, nonroad vehicles, and nonroad engines, and for other purposes.Official Title as Introduced
DEF ActShort Title(s) as Introduced
Diesel Engine Flexibility ActShort Title(s) as Introduced
Legislative history5
Jul 14, 2026
House · CommitteeForwarded by Subcommittee to Full Committee by Voice Vote.
Jul 14, 2026
House · CommitteeSubcommittee Consideration and Mark-up Session Held
Jul 9, 2026
HouseReferred to the House Committee on Energy and Commerce.
Jul 9, 2026
House · CommitteeReferred to the Subcommittee on Environment.
Jul 9, 2026
IntroducedIntroduced in House