Republicans have won enough seats to control the U.S. House, completing the party’s sweep into power and securing their hold on U.S. government alongside President-elect Donald Trump.

The party protected vulnerable incumbents and picked off Democrats in competitive districts, handing the president-elect a unified Congress to enact his agenda.

Mitch McConnell (R-Ky.) will lead Senate Republicans. Senate Republicans voted, anonymously, to elect Sen. John Thune (R-S.D.) the next Senate Majority Leader, after Republicans flipped the Senate in last week’s election.

S.D., as the next party leader, launching a new era for the GOP after nearly two decades with Sen. Mitch McConnell, R-Ky., leading the party in the Senate.