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's surprise public remarks Wednesday, in which he said charging 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 with a crime was “not an option” for his office, put new pressure on House Democrats as they scramble to advance their investigations into the president’s conduct.

Mueller’s first public comments since the start of his landmark 22-month probe into Russia's election interference leave 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 Democratic leaders with tough questions about forging a path forward.

The special counsel suggested he won’t appear before Congress to discuss the findings of his 448-page report — potentially depriving Democrats of their key witness — but impeachment advocates found new fuel for a campaign Pelosi has been fighting for months to defuse.

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“The next step is for the House Judiciary Committee to open an impeachment inquiry to formally begin consideration of whether or not articles of impeachment should be filed,” tweeted Rep. David Cicilline David Nicola CicillineClark rolls out endorsements in assistant Speaker race Races heat up for House leadership posts The folly of Cicilline's 'Glass-Steagall for Tech' MORE (R.I.), the head of the Democrats’ messaging arm, after Mueller’s Wednesday morning statement.

Pelosi and other top party leaders have sought Mueller's testimony before several key congressional committees in hopes the former FBI director could shed more light on his report, particularly on the question of whether Trump obstructed justice.

But Mueller made clear Wednesday that he hopes to avoid such an appearance, forcing Democrats to decide whether they will drag him to Capitol Hill with a subpoena, or seek other strategies to advance their probes.

Pelosi, for her part, vowed to charge ahead with those investigations, which have faced fierce headwinds from an administration that’s been increasingly reluctant to cooperate.

“The American people must have the truth,” she said in a Wednesday statement that made no mention of subpoenas.

Complicating leadership’s position was Mueller’s emphasis that his team declined to bring charges against Trump, not because they found no reason to do so, but because it was “not an option” under Department of Justice (DOJ) rules.

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Those guidelines, Mueller said, stipulate “that the Constitution requires a process other than the criminal justice system to formally accuse a sitting president of wrongdoing.”

Mueller did not mention impeachment, but his remarks were widely interpreted as an allusion to that process.

His words have only invigorated lawmakers who are itching to start an impeachment inquiry, giving them new ammunition in pressing party leaders to launch the proceedings immediately.

“It wasn't lack of evidence. It was DOJ policy,” tweeted Rep. Val Demings Valdez (Val) Venita DemingsFlorida Democrat introduces bill to recognize Puerto Rico statehood referendum Sunday shows - Trump team defends coronavirus response Demings slams GOP coronavirus relief bill: Americans 'deserve more than the crumbs from the table' MORE (D-Fla.), an impeachment supporter on the Judiciary Committee. “[Mueller] said that this ‘deserves the attention of every American.’ He's right. Congress must act.”

But the Democrats’ next move remains unclear.

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 chairman of the House Judiciary Committee, has stressed the importance of having Mueller testify before the panel, suggesting he would issue a subpoena if need be. But Nadler’s statement after Mueller’s remarks made no mention of such an order. Instead, he tipped his hat to Mueller for his service, and said the responsibility now falls on Congress “to respond to the crimes, lies and other wrongdoing of President Trump.”

He did not say how lawmakers would go about doing that.

Staging a press conference Wednesday afternoon in New York, Nadler was similarly vague, sidestepping questions about whether he will compel Mueller’s testimony with a congressional subpoena.

“Mr. Mueller told us a lot of what we need to hear today,” Nadler said.

Before Mueller’s remarks, at least 37 House Democrats were on record backing the launch of an impeachment inquiry into Trump. Afterward, Reps. Betty McCollum Betty Louise McCollumOVERNIGHT ENERGY: Trump extends Florida offshore drilling pause, expands it to Georgia, South Carolina | Democrats probe Park Service involvement in GOP convention | Sanders attacks 'corporate welfare' to coal industry included in relief package Democrats probe Park Service involvement in GOP convention Overnight Energy: EPA chief outlines vision for agency under 'Trump's second term' | Agency sued over decision not to regulate chemical linked to fetal brain damage MORE (D-Minn.) and Brendan Boyle (D-Pa.) added their names to the list, though most Democratic lawmakers responded by holding firm to Pelosi’s favored approach of continuing with investigations without making the leap to impeachment.

“We must remain committed to aggressively investigating the president’s wrongdoing and we will not rest until the American people have answers,” said Rep. Katherine Clark Katherine Marlea ClarkDemocratic leaders: Supreme Court fight is about ObamaCare Rep. Robin Kelly enters race for Democratic caucus vice chair Clark rolls out endorsements in assistant Speaker race MORE (Mass.), vice chairwoman of the Democratic Caucus.

Failing to obtain Mueller’s public testimony would be a major blow to Democrats, who are seeking to paint Trump as a corrupt and unfit leader heading into the 2020 elections.

Earlier this month, a CNN poll found that only 3 percent of respondents had read the full Mueller report, and just 10 percent said they had read “some” of it.

Democrats believe that if they can make more voters aware of what is in the report, their support for investigations — and possibly impeachment — will grow.

A pleading statement from Rep. Sean Patrick Maloney (D-N.Y.) encapsulates that push: “I have one simple request: read the report. Listen to it on tape. Call my office, and we’ll read it to you.”

One fix to address the limited awareness is to broadcast witness interview after witness interview so that Democrats can hammer Trump’s actions into the public consciousness, as laid out in the obstruction section of the Mueller report. But the White House has fiercely fought back on that approach, stonewalling Democrats’ subpoenas and other attempts at oversight.

Democrats say they won’t be deterred.

House Majority Leader Steny Hoyer Steny Hamilton HoyerOVERNIGHT ENERGY: California seeks to sell only electric cars by 2035 | EPA threatens to close New York City office after Trump threats to 'anarchist' cities | House energy package sparks criticism from left and right House energy package sparks criticism from left and right Hoyer: House should vote on COVID-19 aid — with or without a bipartisan deal MORE (D-Md.) said Mueller’s testimony could break some of the logjam and clear up lingering questions. He is urging the special counsel to appear before Congress.

“Given that the President has not been cleared of wrongdoing, and given the seriousness of Russia’s interference in our democracy,” Hoyer said, “I believe that the American people deserve to hear testimony from the Special Counsel about his report and the report's conclusions.”