Paul Ryan 
He was part of the Anti Trump crew, his efforts to block subpoenas during the first two years of the Russia Russia Russia investigation was evidence of that.
Seriously Trump had few allies in Congress or the House, most of the Republicans would have been happier to see Clinton elected and as such turned a blind eye to the Democrat onslaught to his candidacy and Presidency. Leaders like Mitch McConnell are the swamp, the so called moderates like John McCain are the same establishment creatures starting wars left right and center are the same ones like Dick Cheney who is no shilling for his daughter who is now the darling of the left is the same person who was most detested during his tenure and seen as one the biggest war mongers of his time, who now warns of the danger Trump poses to the republic.