Sen. Charles Schumer, D-N.Y., on Sunday said he’s hoping four GOP senators will vote with Democrats to call witnesses for a “fair” impeachment trial of President Donald Trump in the upper chamber.

In an interview on ABC News’ “This Week,” Schumer decried that Senate Majority Leader Mitch McConnell, R-Ky., “will not go for a fair trial.”

“When these articles come over, the focus will be on four Republican senators,” he declared.

“You can't have a fair trial without witnesses and documents, particularly those that were right at the scene of the charges,” Schumer explained.

“But four Republican senators can join us. We have the ability to require votes on the four witnesses we have asked for, whether there's an agreement or not. We have the ability to ask for the documents.

“And I hope, pray, and believe there's a decent chance that four Republicans will join us. If they do, we will have a fair trial.”

He suggested the four Republicans may not even ultimately vote for removal.

“If they vote for witnesses, if four of them join us to get witnesses and documents, it doesn't mean they're going to vote to convict the president,” he said. “It means we will hear all the evidence. It may, as I said, be exculpatory. It may be further condemning the president. And then the chips will fall where they may.”

He also derided the model for the impeachment trial of President Bill Clinton, where there were arguments from the lawyers on both sides for two weeks, then a vote, then consideration of whether to have witnesses come forward.

“Where, but in ‘Alice in Wonderland,’ do we hear all the arguments, and then maybe have the evidence, the witnesses, and the trial?” he asked.

Weighing in on the killing of Iran's top military leader, Schumer said he's "worried" about the lack of participation by Congress in that decision.

"I am really worried, and that is why Congress must assert itself... I think Congress and I will do everything I can to assert our authority. We do not need this president either bumbling or impulsively getting us into a major war."