The Wall Street Journal says Bob Corker is one of the Senators to potentially make trouble for Mitch McConnell in the new Congress. The reason is that he is a possible presidential contender along with Ted Cruz (Texas), Marco Rubio (Fla.), Rand Paul (Ky.), and Lindsey Graham (S.C.) and they will be competing for the most conservative early-state primary
voters and their priorities won’t always coincide with Mr. McConnell.
Other possible Senator who may make trouble for McConnell are a couple Senators concerned about the next primary election, four Senators from blue states concerned about a Democrat challenger next election, liberal Susan Collins, and three conservative new comers. To read the article follow this link.