Democrat: Rep. Pete Visclosky of Indiana announced on Nov. 6, 2019, that he will not seek reelection in 2020. Visclosky chairs the House appropriations subcommittee on defense.
Democrat: Rep. Denny Heck of Washington announced on Dec. 4, 2019, that he will not seek reelection in 2020. Heck is a member of the House Intelligence Committee and he cited the committee's work on the impeachment inquiry into President Donald Trump as having "rendered my soul weary."
Courtesy Ted Yoho via CNN
Republican: Rep. Ted Yoho of Florida announced on Dec. 10, 2019, he won't seek reelection, saying he will "pass the baton onto a new generation" and honoring his campaign promise not to serve more than four terms.
US House of Representatives
Republican: Rep. Mark Walker of North Carolina announced on Dec. 16, 2019, that he won't seek reelection, saying instead he will "take a look at the 2022 Senate race."
Republican: Rep. Francis Rooney of Florida announced on Oct. 19, 2019, he will not seek reelection, after suggesting he was open to supporting the impeachment of President Donald Trump.
Republican: Rep. Pete Olson of Texas announced on July 25, 2019, in a statement that he will not run for reelection in 2020.
Republican: Rep. Paul Mitchell of Michigan announced on July 24, 2019, in a House floor speech that he will not seek reelection.
Republican: Rep. Kenny Marchant of Texas announced on Aug. 5, 2019, that he will not run for reelection, writing in a statement "I am looking forward to finishing out my term and then returning to Texas to start a new chapter."