After the 2020 presidential election, Kinzinger became known for his vocal opposition to Republican President Donald Trump’s false claims of voter fraud and attempts to overturn the results. Kinzinger was one of 10 Republicans who voted to impeach Trump for incitement of insurrection in his second impeachment, and was one of only two Republicans to vote to create a select committee to investigate the 2021 attack on the U.S. Capitol, which he was subsequently appointed to.