The US House voted today to send two articles of impeachment against President Donald Trump to the Senate and approve House prosecutors for only the third impeachment trial in American history.
The nearly party-line vote moved Trump's impeachment from Speaker Nancy Pelosi's Democratic-run House of Representatives to the Republican-majority Senate, where Trump expects quick acquittal, even as new evidence is raising fresh questions about his Ukraine dealings.
The vote was 228-193, coming at the start of a presidential election year and one month after the House impeached Trump alleging abuse of power over his pressure on Ukraine to investigate Democratic rival Joe Biden, using military aid to the country as leverage.
Trump was also charged with obstructing Congress' ensuing probe.
"We are here today to cross a very important threshold in American history," Pelosi said, addressing the House before the vote.
"This is what an impeachment is about,'' she said earlier, announcing the prosecution team. "The President violated his oath of office, undermined our national security, jeopardised the integrity of our elections."
Trump, during an event at the White House, rejected the charges as a "hoax."
The President's team expects acquittal with a Senate trial lasting no more than two weeks, according to senior Administration officials unauthorised to discuss the matter and granted anonymity.
Trump opposes the calling of additional witnesses, and the officials said they expect the trial to conclude before Trump delivers his State of the Union address on February 4.
All but one Democrat, Representative Collin Peterson of Minnesota, voted to transmit the articles. All Republicans voted against. One former Republican-turned-independent, Representative Justin Amash of Michigan, joined Democrats.
The top Republican in the House, Kevin McCarthy of California, said Americans will look back on this "sad saga" that tried to remove the President with the "weakest case."
The House managers were to walk the articles across the Capitol to the Senate in a dramatic procession. The Senate trial is set to start tomorrow.
The seven-member prosecution team will be led by the chairmen of the House impeachment proceedings, Congressmen Adam Schiff of the Intelligence Committee and Jerry Nadler of the Judiciary Committee, two of Pelosi's top lieutenants for only the third presidential impeachment in the nation's history.
Ahead of today's session, Schiff released new records from Lev Parnas, an associate of Trump lawyer Rudy Giuliani, about the Ukraine strategy. including an exchange with another man about surveilling later-fired Ambassador Maria Yovanovitch.
Schiff said the new evidence should bring more pressure on Senate Majority Leader Mitch McConnell, who is reluctant to allow witnesses to testify.
"If McConnell makes this the first trial in history without witnesses, it will be exposed for what it is and that is an effort to cover up for the President," Schiff said.
McConnell opened the Senate dismissing what he called a rushed impeachment that is more about the politics of Democrats who don't like Trump than the charges against him.
"This isn't really about Ukraine policy or military money," McConnell said. "This has been naked partisanship all along."
During Pelosi's press conference announcing managers, Trump tweeted that impeachment was "another Con Job by the Do Nothing Democrats. All of this work was supposed to be done by the House, not the Senate!"
The Constitution calls for the chief justice to preside over senators, who serve as jurors and swear an oath to deliver "impartial justice.''
The managers are a diverse group with legal, law enforcement and military experience, including Hakeem Jeffries of New York, Sylvia Garcia of Texas, Val Demings of Florida, Jason Crow of Colorado and Zoe Lofgren of California.
McConnell, who is negotiating rules for the trial proceedings, is under competing pressure from his party for more witnesses, from centrists who are siding with Democrats on the need to hear full testimony and conservatives mounting Trump's defence.
Senator Susan Collins of Maine is leading an effort among some Republicans, including Mitt Romney of Utah and Lisa Murkowski of Alaska for votes on witnesses.
Democrats have been pushing Republicans to consider new testimony, arguing that fresh information has emerged during Pelosi's month-long delay in transmitting the charges.
Republicans control the chamber, 53-47, and are all but certain to acquit Trump. But it takes just 51 votes during the trial to approve rules or call witnesses. Just four GOP senators could form a majority with Democrats to insist on new testimony. It also would take only 51 senators to vote to dismiss the charges against Trump.