President Donald Trump, flanked by Vice President Mike Pence and Idaho Gov. Brad Little participates in a roundtable discussion at the White House. Picture: Jabin Botsford/Washington Post

Washington – A contingent of Democratic House members from Republican-leaning districts announced one by one Monday that after weeks of extraordinary pressure they have decided to vote to impeach President Donald Trump, as the House hurtles toward historic action later this week.

Monday’s announcements dealt a blow to Trump and his allies, who had been encouraging Democrats to defect to bolster their depiction of impeachment as a crusade by extremist liberals. The White House had mounted an all-out effort to pressure the centrists, many of whom faced a blitz of anti-impeachment ads and are risking significant political damage.

These Democrats characterized their choices as acts of conscience. “The president’s actions violate his oath of office, endanger our national security and betray the public trust,” said Rep. Abigail Spanberger, D-Va., a freshman who represents a Richmond-area district that voted for Trump in 2016.

With the outcome in the House increasingly certain, Senate leaders maneuvered Monday to set parameters for a possible trial, which would begin in January. Senate Minority Leader Chuck Schumer, D-N.Y., demanded the chamber conduct a “full and fair trial,” including live testimony from acting White House chief of staff Mick Mulvaney and other administration officials. A trial without witnesses, which many Republicans favor, would amount to “a coverup,” Schumer said.

Republican leaders dismissed Schumer’s request, arguing that decisions about witnesses should not be made before the trial begins. Senate Republicans have largely coalesced around a strategy of calling no witnesses and restricting the length of a trial, although no decisions have been made.