2012

In June 2011, Williams announced that he was dropping his Senate bid to instead run for Texas's 25th congressional district.^[5][6] The district was a newly drawn district stretching from central Austin to Burleson. Congressional district 25 has been cited as one of Texas's most gerrymandered districts.^[7][8] Williams does not live in the district; his home in Weatherford is in Texas's 12th congressional district.

Williams ranked first with 25% of the vote and qualified for a runoff election. Wes Riddle ranked second with 15%.^[9] In the July 31 runoff, Williams defeated Riddle, 58% to 42%.^[10] In the November general election, Williams defeated Democratic nominee Elaine Henderson, 58%–37%.^[11]

2014

In the November 4 general election, Williams defeated Democrat Marco Montoya and Libertarian John Betz, receiving 107,120 votes (60.22%) to Montoya's 64,463 (36.24%) and Betz's 6,300 (3.54%).^[12] Williams unsuccessfully challenged National Republican Congressional Committee chair Greg Walden of Oregon in Walden's bid for reelection as chair after the election.^[13]

2016

Williams won his third term in the House on November 8, when Donald Trump carried the electoral vote majority over Hillary Rodham Clinton. Williams polled 180,988 votes (58.4%) to Democratic nominee Kathi Thomas's 117,073 (37.7%). Libertarian Loren Marc Schneiderman received 12,135 votes (3.9%).^[14]

2018

Williams won his fourth term in the House in the general election on November 6. With 162,288 votes (53.6%), he defeated Democratic nominee Julie Oliver, who polled 135,288 (44.7%). Another 5,124 (1.7%) went to the Libertarian Party nominee, Desarae Lindsey.^[15]

2020

Williams was reelected with 56% of the vote to Democratic nominee Julie Oliver's 42%. Libertarian nominee Bill Kelsey won 2% of the vote.^[16]

2016 House ethics review

On May 3, 2016, the House Ethics Committee initiated an investigation into Williams after he inserted a provision into a $300 billion transportation funding bill, the Fixing America's Surface Transportation Act, that exempted some car dealerships like his from a proposal to prevent rental car companies from renting out vehicles that were subject to safety recalls.^[20] The legislation was spurred by the deaths of Raechel and Jacqueline Houck,^[21] who were killed in 2004 while driving a rented, recalled vehicle that caught fire and crashed into a semi.^[22] The investigation's focus was a provision Williams authored that would have exempted dealerships like his and allowed renting vehicles under active safety recall.^[23][24] The independent nonpartisan Office of Congressional Ethics found that Williams violated House ethics rules, noting that he refused to cooperate; by unanimous, bipartisan vote the OCE found that "there is substantial reason to believe that Rep. Williams' personal financial interest in his auto dealership may be perceived as having influenced his performance of official duties—namely, his decision to offer an amendment to the surface transportation legislation".^[25] The House Ethics committee determined that the amendment "could have affected Representative Williams' personal financial interests" but decided to end the investigation and took no further action.^[26][27]

COVID-19 Paycheck Protection Program loan

During the COVID-19 pandemic, Williams's Chrysler Dodge Jeep dealership in Weatherford, Texas, received a loan of between $1 million and $2 million as part of the Paycheck Protection Program (PPP);^[28][29] the loan was later forgiven.^[30][31]

U.S. Representative Katie Porter later introduced legislation that would require all loans under the PPP to be made public.^[32][33] The Washington Post highlighted March 2020 comments by Williams in The Epoch Times, where he said, "A socialist wants you to get a check from the government...a capitalist wants you to get a check from the place that you work."^[34]

Williams voted against the TRUTH Act (H.R. 6782), a bill that would have required public disclosure of companies that received funds through the bailout program.^{[35][36][37][38]}

Texas v. Pennsylvania

In December 2020, Williams was one of 126 Republican members of the House of Representatives to sign an amicus brief in support of Texas v. Pennsylvania, a lawsuit filed at the United States Supreme Court contesting the results of the 2020 presidential election, in which Joe Biden defeated Trump.^[39] The Supreme Court declined to hear the case on the basis that Texas lacked standing under Article III of the Constitution to challenge the results of an election held by another state.^[40][41][42]