Senate GOP leader John Thune (R-S.D.) is primed to hand President Trump a quick string of wins on his first days in office. Why it matters: Thune and Trump have a complicated history, but the new majority leader is doing his best to start Congress off on the right foot.

Kimberley Thune, Senate Majority Leader John Thune (R-S.D.), Jennifer Scalise and House Majority Leader Steve Scalise (R-La.). Photo: Jack Gruber - Pool/

Senate Majority Leader John Thune (R-SD) previewed what the first 100 days of the second Trump administration will focus on, specifically how Congress will work with President-elect Donald Trump to put the United States “back on track.