Fetterman.

“Fetterman, who has frequently challenged his own party, said his vote was “rooted in a strong committed, constructive working relationship with Senator Mullin for our nation’s security.””

https://apnews.com/article/markwayne-mullin-homeland-security-rand-paul-senate-a64e8f7ad315a3e64e32a758e5494630

Mullin's DHS nomination advances to full Senate after narrow committee vote

Markwayne Mullin has moved a step closer to becoming President Donald Trump’s next homeland security secretary. A Senate committee on Thursday narrowly advanced the nomination of the Republican senator from Oklahoma. The 8-7 vote came after a contentious hearing Wednesday and sent the Cabinet nomination to the full Senate, which could act to confirm Mullin next week. That vote included a “no” from the Republican chairman, Rand Paul of Kentucky, and a “yes” from a Democrat, John Fetterman of Pennsylvania. The approval comes at a time when the parties are fighting bitterly over the policies of the Department of Homeland Security, leading to a funding lapse that is now in its 34th day.

AP News

@samlitzinger

Probably a stupid 'UK thinking' question, but why don't the Dems just kick him out of the party. It's what would happen here if someone repeatedly supported the opposition on important matters. Our MPs will often rebel, but usually en masse over a matter of principal. Someone just repeatedly backing the other team, on their own would 'lose the whip'. Main benefit to party is it means they can't stand as a member at the next election so you are 1 term away from excising the boil.

@lee_eyres @samlitzinger he is not getting the Democratic endorsement in the future and will run as a Republican.