House Judiciary Chairman Jerrold Nadler, D-N.Y., accused Senate Republicans who may be reluctant to call witnesses of being “part of the cover-up.”

A ploy clearly intended to persuade a number of weak-kneed liberal Republicans to cave — Democrats only need four GOP defections to win out on calling witnesses.

One of the House impeachment managers in President Trump‘s Senate trial, Nadler appeared on CBS’s “Face the Nation” to declare: “In any trial in any trial, all relevant witnesses must be heard.”

Never mind that the witnesses Senate Democrats are hoping to call were not called by House Democrats, a list that includes John Bolton, Trump’s former national security adviser.

“This whole controversy about whether there should be witnesses is really a question about of does the Senate want to have a fair trial or are they part of the cover-up of the president,” Nadler said.

He then impugned the integrity of any GOP senator who doesn’t fall in line with their tactics: “Any Republican senator who says there should be no witnesses, or even that witnesses should be negotiated, is part of the coverup.”

Talking out of both sides of his mouth, no sooner had Nadler said that did he declare that Hunter Biden should not be called as a witness.

(The curmudgeon Democrat seemed oblivious to how hypocritical he was being on national television.)

“I’m saying that Hunter Biden has no knowledge of the accusations against the president,” Nadler responded when asked about whether former Vice President Joe Biden’s son should be called.

“Their asking for Hunter Biden is just more of a smear of Hunter Biden that the president was trying to get the Ukraine to do,” Nadler added.

Interestingly, Nadler was more than content to let Chief Justice John Roberts make the determination — which tips the hand on how Democrats view Roberts.

“But no chief justice would think of admitting evidence that is not relevant. No trial judge would in any trial,” he said.

Speaking of weak-kneed Republican Senators — Sens. Lisa Murkowski, R-Alaska; Mitt Romney, R-Utah; and Susan Collins, R-Maine, come to mind — the president’s eldest son, Donald Trump Jr. had his own thoughts.

Appearing on Fox News’ “Sunday Morning Futures,” Trump Jr., said “impeachment started Nov. 9th, 2016,” as he called for GOP lawmakers to go on record about where they stand on calling new witnesses, which includes defense witnesses.

“The, let’s call it weaker Republicans … make a vote on it, if some of those guys don’t want to hear from the witnesses we would want to hear from but will hear from the others, I want to know about it because they don’t deserve to be in office,” he said.

“Hearing from everyone is totally fair. That’s not what we’ve heard so far while the Democrats have controlled the process,” Trump Jr. added.

Trump Jr. also commented on Lev Parnas, a Rudy Giuliani associate who was indicted last year on campaign finance charges — at the 11th hour, House Democrats rolled out “new evidence” that centered on Parnas.

“I met him at some fundraising events,” Trump Jr. said. “I didn’t even realize he was Ukrainian, I thought he was Israeli. That’s the problem with how this world works, you take a couple pictures with someone, if someone’s a donor, they get in line, they stood at a dinner with 50 people.”

“The media then takes it, ‘Oh! They’re buddies!’ I guarantee my father couldn’t pick this guy out of a lineup,” he added. “That doesn’t mean he hasn’t taken pictures with him.”