Senators began debate Tuesday afternoon over the rules that will guide the impeachment trial of President Trump — just the third in history of a U.S. president — focused on his conduct toward Ukraine.

The Senate rejected Democratic amendments to subpoena records from the White House, State Department, Defense Department and Office of Management and Budget related to the Ukraine probe. The White House stonewalled requests for those records by House investigators during their inquiry.

The Senate also rejected amendments to subpoena Trump administration officials, including acting White House chief of staff Mick Mulvaney; his senior adviser, Robert Blair; and top Office of Management and Budget official Michael Duffey. Each amendment was tabled on a 53-to-47 party-line vote.

Senators are hearing from House managers and Trump’s attorneys regarding a resolution proposed by Senate Majority Leader Mitch McConnell (R-Ky.) that seeks a swift trial. Democrats, including Senate Minority Leader Charles E. Schumer (N.Y.), have panned the proposal, arguing that it is part of an effort to “cover up” Trump’s dealings. In public appearances Tuesday, the House impeachment managers urged the Senate to reject McConnell’s rules.

The impeachment charges center on the allegation that Trump withheld military aid and a White House meeting to pressure Ukraine to investigate former vice president Joe Biden, a political rival, as well as his son Hunter Biden.

●White House calls for Trump acquittal in ‘rigged’ impeachment as Senate prepares for quick trial.

●Trump’s lawyers, Senate GOP allies work privately to ensure former national security adviser John Bolton does not testify publicly.

●Republicans rally behind Trump as Senate impeachment trial begins.