The House Judiciary Committee, which would consider articles of impeachment against President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE if that process moves forward, is set for a pivotal week.

Rep. Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.), the panel’s chairman, has jostled for weeks with the administration to secure more documents and witness testimony — including that of special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE — to guide probes into Russian election interference and allegations that Trump obstructed Mueller’s investigation.

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But the efforts have come up largely empty in the face of the administration’s near-blanket refusal to honor those requests, leading to confrontations about holding administration officials for contempt and raising the pressure on Democratic leaders to consider impeachment.

The dynamics leave Nadler squeezed between Speaker Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.) and other top leaders, who want to continue the investigations without invoking the Article I powers of impeachment, and a restive caucus that’s moving slowly but steadily toward the belief that they have no other choice.

“Obviously people are frustrated that we haven’t moved faster. And, frankly, I'm frustrated because we have been held up by the unprecedented action by the White House to deny our witnesses,” Nadler said Friday in a radio interview on WNYC. “And we can only go so far, until we win in court, to get those witnesses.”

Democrats’ court battles with the Trump administration, Nadler added, should wrap up “hopefully in September, October.”

Yet many Democrats don’t want to wait that long. Fifty lawmakers are already endorsing the immediate launch of an impeachment inquiry — a campaign Pelosi has sought to defuse — and even those supporting party leaders in their investigative approach are reaching the end of their ropes.

Complicating Nadler’s dilemma, Mueller last week sought to dissuade Democrats from pursuing his appearance before Congress. “The report is my testimony,” Mueller said, vowing not to discuss anything outside the confines of the document.

“I hope and expect this to be the only time that I will speak about this matter,” he said Wednesday during brief remarks at the Department of Justice, marking his first public statement since being tapped as special counsel two years ago.

The remarks have done nothing to assuage impatient Democrats hungry for the opportunity to have Mueller on the witness stand, where they intend to press him on countless questions still lingering around his report, most notably his decision not to bring obstruction of justice charges against the president.

If Mueller is confident the public can glean his findings by reading the 448-page report, Democrats think the better way to broadcast his message is via televised hearings with the author himself.

“He can help parameterize and bring the report to life for the American people,” Rep. Ro Khanna Rohit (Ro) KhannaThe Hill Interview: Jerry Brown on climate disasters, COVID-19 and Biden's 'Rooseveltian moment' Congress needs to prioritize government digital service delivery DeJoy defends Postal Service changes at combative House hearing MORE (D-Calif.), a liberal who's backing Pelosi's cautious approach, said by phone. “Many people will watch those hearings. ... Even if it's Bob Mueller sitting there reading the report [and taking questions] — that's fine.”

Nadler has been negotiating with Mueller’s team to get the special counsel to come to Capitol Hill voluntarily. Nadler had previous threatened to subpoena the special counsel to secure that testimony, but has not reiterated that message since Mueller spoke at the Justice Department last week. And many rank-and-file Democrats think Mueller — a former FBI director who has cultivated a by-the-book, law-and-order reputation during his many years in Washington — will ultimately concede to the invitation.

“I think he'll volunteer; I think he cares too much about the process,” Khanna said. “I don't see him defying the congressional request.”

Nadler said Mueller will testify one way or another.

“We will have Mr. Mueller’s testimony. I think it's very important that he testify before the American people, even if he doesn't say anything beyond what he said there,” Nadler said. “The attorney general and the president and others are lying all the time about what was in the report and it's very important that he, to the TV audience and to the American people ... answer questions about it, even if there is no new information. ...

“Most people are not going to read the 448-page report.”

The debate over next steps is sure to bubble up when Congress returns to Washington Monday after their weeklong Memorial Day break. They won’t have much time for debate, however, as the House is expected to cut the week short, taking off Thursday and Friday, to observe the 75th anniversary of the invasion of Normandy during World War II.

Before the Memorial Day recess, Nadler had privately made the case to Pelosi that it was time for Democrats to launch impeachment proceedings against Trump — an entreaty that the Speaker firmly rejected. Speaking to WNYC, Nadler argued that impeachment by the House may still be necessary even though millions of voters will be rendering their verdict on Trump in November 2020.

“Well, impeachment is ... there might still be a point to it. And that point is to say to future presidents, you cannot do this, to vindicate the Constitution, to say there are certain things that cannot be done,” Nadler said. “God willing, we have to defeat Trump. ... His reelection would be a national catastrophe.

Whatever Nadler decides will be his next step, he’ll have to take it this week, said a Democratic source on Capitol Hill. “He needs to close the deal while we have momentum from Mueller’s statement last week.”

Updated at 7:19 a.m.