Who senators choose, and whether Trump ultimately endorses a candidate in the final hours, could set the tone for Trump’s attempts to assert control over the legislative branch.

U.S. Senate Republicans will gather behind closed doors on Wednesday to pick their next leader in the face of a public pressure campaign by supporters of President-elect Donald Trump who favor the long-shot bid of a hardline Trump loyalist.

The Republican Party is on track to maintain control of the United States House of Representatives, solidifying its grip on the federal government following significant wins in the Senate and Donald Trump’s presidential victory.