Paul Ryan spoke recently on how the house was closer to a governing coalition than a bi-party system. The Post has an article that outlines out Senator McConnell is learning the same us true of the senate.
Out of 51 Republicans, McConnell can count on about 45 as mostly reliable votes. McCain, even when he is here, is often ready to buck the leader. Sens. Susan Collins (R-Maine) and Lisa Murkowski (R-Alaska) break ranks as moderates, while Sens. Rand Paul (R-Ky.) and Mike Lee (R-Utah) regularly cause headaches from the conservative flank.
While this clearly isn’t the Freedom Caucus, it seems like it is more and more the future of Congress.