Republicans have officially won a full trifecta of power in Washington, D.C., following GOP victories in several key U.S. House contests.

Republicans are poised to keep their hold on the House in the new year, as the AP just called enough House races in their favor. Having scored a sweep in this month’s election, the party is expected to focus on the upcoming expiration of their 2017 tax cuts,

The 22nd Amendment says, "No person shall be elected to the office of the President more than twice," and it also says vice presidents who eventually become president can be elected to two terms if they have served less than two years of their predecessors' terms, according to the Congressional Research Service.

Donald Trump has joked about running for a third term as president even though it would flout the rules of the US constitution.