Speaker Nancy Pelosi named House prosecutors for President Donald Trump’s impeachment trial on Wednesday ahead of votes to send the charges to the Senate, even as new information about the president’s Ukraine efforts intensified pressure for more witnesses.

The seven-member prosecution team will be led by the chairmen of the House impeachment proceedings, Reps. 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.

“Today is an important day,” said Pelosi, flanked by the team. “This is about the Constitution of the United States.”

The managers are a diverse group with legal, law enforcement and military courtroom experience, including Hakeem Jeffries of New York, Sylvia Garcia of Texas, Val Demings of Florida, Jason Crow of Colorado and Zoe Lofgren of California.

Ahead of Wednesday’s House vote to approve the team and transmit the articles of impeachment, 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.

During Pelosi’s press conference, 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!”

Trump was impeached by the Democratic-led House last month on charges of abuse of power over his pressure on Ukraine to investigate Democratic rival Joe Biden as Trump withheld aid from the country. Trump was also charged with obstructing Congress’ ensuing probe.

After Wednesday’s House vote to send the articles of impeachment to the Senate for trial, the managers are to walk the articles across the Capitol to the Senate in a dramatic procession.

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.”

Trump’s trial will be only the third presidential impeachment trial in U.S. history, and it comes against the backdrop of a politically divided nation in an election year.

The Senate is expected to transform into an impeachment court as early as Thursday, although significant proceedings wouldn’t begin until next Tuesday after the Martin Luther King Jr. holiday. The Constitution calls for the chief justice to preside over senators, who serve as jurors and swear an oath to deliver “impartial justice.″

McConnell, who is negotiating rules for the trial proceedings, said all 53 GOP senators are on board with his plan to start the session and consider the issue of witnesses later.

Senate Republicans signaled they would reject the idea of simply voting to dismiss the articles of impeachment against Trump, as Trump himself has suggested. McConnell agreed he does not have the votes to do that.

“There is little or no sentiment in the Republican conference for a motion to dismiss,” McConnell said Tuesday. ’’Our members feel we have an obligation to listen to the arguments.”

A mounting number of senators say they want to ensure the ground rules include the possibility of calling new witnesses.

Sen. 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.

Romney said he wants to hear from John Bolton, the former national security adviser at the White House, who others have said raised alarms about the alternative foreign policy toward Ukraine being run by Giuliani.

Democrats have been pushing Republicans to consider new testimony, arguing that fresh information has emerged during Pelosi’s monthlong 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.

At Tuesday’s private GOP lunch, Sen. Rand Paul of Kentucky warned that if witnesses are allowed, defense witnesses could also be called. He and other Republicans want to subpoena Biden and his son, Hunter, who served on the board of a gas company in Ukraine, Burisma, while his father was vice president.

McConnell prefers to model Trump’s trial partly on the process used for President Bill Clinton’s impeachment trial in 1999. It, too, contained motions for dismissal or calling new witnesses.

McConnell is hesitant to call new witnesses who would prolong the trial and put vulnerable senators who are up for reelection in 2020 in a bind with tough choices. At the same time, he wants to give those same senators ample room to show voters they are listening.

(AP)