Mitch McConnell
Trump acolyte Lindsey Graham also received a mocking mention from the MSNBC "Morning Joe" host.
The 82-year-old Kentucky Republican last year became the longest-serving Senate leader in U.S. history.
The late-night show ripped the Senate minority leader for endorsing the former president despite years of acrimony.
Republican leaders and party influencers had a brief window to define Donald Trump and his actions following Jan. 6, but they failed to act.
WHAT'S HAPPENING
The top Senate Republican once rebuked the former president over the Jan. 6 insurrection. Now he's bending the knee ahead of the 2024 election.
McConnell's team and Trump's campaign have reportedly also been in talks over a strategy to unite Republicans up and down the party's ticket before the election.
The Florida Republican launched an unsuccessful run against the GOP Senate leader following the party's underwhelming performance in the 2022 midterms.
"I’m going to do everything I can to convince my colleagues," the South Dakota senator said.
The MSNBC host broke down how the Senate minority leader has left his post "diminished" as he prepares to leave GOP leadership.
The so-called institutionalist is one of the biggest change agents in recent political history.