Tenure
When Mike Espy resigned from the U.S. House of Representatives in Mississippi's 2nd congressional district to become Secretary of Agriculture in 1993, Thompson ran in the special election to succeed him. With five other Democrats splitting the vote, he finished second, behind Republican Hayes Dent with 28% of the vote in the March 30, 1993, primary election. He then defeated Dent in the April 13 runoff with 55% of the vote. He won the seat again in 1994 and has been reelected 12 times. He has faced serious opposition only twice, when journalist Clinton LeSueur held him to 55% in 2002 and 58% in 2004.
Thompson became an outspoken advocate for the Gulf Coast after Hurricanes Katrina and Rita hit in 2005. From his position on the Homeland Security Committee, he pushed for accountability at the Federal Emergency Management Agency (FEMA) and a careful review of the role of the Red Cross in the time of disaster. He also pursued waste, fraud, and abuse in hurricane contracting and called for preferences to be given to small and Gulf Coast businesses in the recovery and rebuilding of the affected states. Thompson is the founding member of the bipartisan Gulf Coast Recovery & Rebuilding Caucus in the House of Representatives.
Thompson's voting record has been decidedly liberal; he is by far the most liberal member of the Mississippi delegation and arguably one of the most liberal congressmen ever to represent the state. His legislative platform focuses mainly on homeland security, civil rights, agriculture and rural issues, equal education, and health care reform. In 1975, he became one of the original plaintiffs in the Ayers Case, which concerned the adequate funding of predominantly black educational institutes in Mississippi. In 2000, Thompson wrote legislation that created the National Center for Minority Health and Health Care Disparities.
During his tenure as chairman of the Homeland Security Committee, Thompson focused on assuring that state and local officials, as well as first responders (fire, police, EMTs), got the resources they needed to protect their communities. Thompson was particularly concerned about local officials getting adequate resources, having been a volunteer firefighter and a local elected official for 24 years.
Thompson was one of 31 House Democrats to object to the certification of the results of the 2004 presidential election in Ohio. President George W. Bush won Ohio, the state the representatives objected to counting, by 118,457 votes. Democrats claimed the results were tainted by irregularities or fraud. These claims were investigated and rejected by journalists, and Democratic nominee John Kerry, who did not contest the election result. As of 2021, Thompson stands by his vote, claiming it was "based on what the issues are at that time. But again, I didn't tear up the place because I cast a vote."
Along with John Conyers, in April 2006 Thompson brought an action against George W. Bush and others alleging violations of the Constitution in the passing of the Deficit Reduction Act of 2005. The case, Conyers v. Bush, was ultimately dismissed.
On January 5, 2007, Thompson introduced H.R.1, "Implementing the 9/11 Commission Recommendations Act of 2007", the first bill of the 110th Congress. The bill, cosponsored by more than 100 House Members, provided for the implementation of the 9/11 Commission's remaining recommendations. It included provisions requiring major improvements in aviation security, border security, and infrastructure security; providing first responders the equipment and training they need; beefing up efforts to prevent terrorists from acquiring weapons of mass destruction; and significantly expanding diplomatic, economic, educational, and other strategies designed to counter terrorism. The bill had bipartisan support and passed 299–128 on January 9, 2007. On July 27, 2007, the Conference Report on H.R. 1 passed the House overwhelmingly, 371–40. The previous day, it had passed the Senate 85–8. The President signed H.R. 1 into law on August 3, 2007.
With the passage of H.R. 1, Thompson is the first African-American Chairman of a House Committee to have a House–Senate Conference on the first bill introduced in either the House or the Senate in any given Congress.
On December 27, 2009, commenting on reports that Umar Farouk Abdulmutallab, who had allegedly tried to set off a suicide bomb on Northwest Airlines Flight 253 on December 25, 2009, had subsequently confessed to being trained and equipped in Yemen,
Thompson called for a halt to all current plans with regard to Yemen in light of Abdulmutullab's ties there, including plans to repatriate approximately 80 Yemeni captives in Guantanamo.
Thompson is a supporter, and one of the proposers of, a bill to prevent auto insurance companies from using credit scores to set their rates, which supporters claim would lower rates for Americans in financial struggle. The bill proposed that auto insurance rates be based solely on factors related to "skills and responsibility behind the wheel", excluding factors such as debt or poor credit elsewhere. The bill has not been enacted.
Thompson has also been a supporter of a measure to increase screening and background checks for pilot trainees to reduce chances of terrorist exploitation. The bill, H.R. 6159, would require all applicants to go through a waiting period while they are screened and cleared by the Department of Homeland Security. Currently, only foreign-born trainees are required to go through this screening. The bill has not been enacted.
In July 2014, Thompson joined Senator Ron Wyden in introducing a bill to limit the number of documents that are classified and to overhaul the security clearance system. The bill stalled and was not passed.
On April 1, 2020, Thompson and other Democratic lawmakers on the House Homeland Security Committee introduced legislation that would create a commission tasked with "producing a full and complete accounting of the nation's preparedness and response to the coronavirus". He compared this to the 9/11 Commission, saying, "while we don't yet know the full impact the coronavirus will have on the nation," already "more Americans have been killed by the virus than died in the September 11, 2001, attacks". A bipartisan group of House lawmakers would appoint 25 commission members, and 18 months after its initial meeting, a "public report detailing recommendations for the development of a national plan to address public health and the economic and social impacts of future pandemics" would be published.
For his tenure as the chairman of the House Homeland Security Committee in the 116th Congress, Thompson earned an "A" grade from the non-partisan Lugar Center's Congressional Oversight Hearing Index.
On March 3, 2021, Thompson was the only House Democrat to vote against the For the People Act, a top legislative priority of House Democrats that would reform campaign finance and election laws and expand voting rights. Despite initially cosponsoring the bill, Thompson said his vote "was no accident", explaining, "My constituents opposed the redistricting portion of the bill as well as the section on public finances. I always listen and vote in the interest of my constituents."
In April 2024, Thompson introduced (along with eight other Democrats) a bill to strip Secret Service protection from convicted felons (intended to include former President Donald Trump) after Trump was convicted in New York in May 2024.
