Rep. Justin Amash Justin AmashInternal Democratic poll shows tight race in contest to replace Amash Centrist Democrats 'strongly considering' discharge petition on GOP PPP bill On The Trail: How Nancy Pelosi could improbably become president MORE (R-Mich.), the lone Republican to endorse impeaching 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, said Wednesday that Congress has to take action after 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 maintained that charging President Trump wasn't an option.

"The ball is in our court, Congress," Amash tweeted on Wednesday.

The ball is in our court, Congress. https://t.co/idpQo1xItH — Justin Amash (@justinamash) May 29, 2019

Amash's tweet came shortly after Mueller gave his first public statement since taking over the investigation into Russian interference in the 2016 presidential election nearly two years ago.

It also came after Amash held his first public town hall in his Michigan district since he endorsed impeaching Trump earlier this month. The GOP congressman supported beginning impeachment proceedings in light of the Mueller report's findings on the president's attempts to undermine the investigation.

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Mueller said in his statement Wednesday that he would not testify before Congress and wouldn't offer any commentary beyond what was laid out in his report about Russia's efforts to interfere in the election and documentation of Trump's possible efforts to obstruct the investigation.

But Mueller said his office concluded that they could not bring charges against Trump as they investigated whether he obstructed justice, citing current Justice Department guidance which states that a sitting president can't be indicted.

Mueller also reiterated that while his report "does not conclude that the president committed a crime, it also does not exonerate him."

"After that investigation, if we had had confidence that the president clearly did not commit a crime, we would have said so," Mueller said.

Amash received a standing ovation Tuesday evening at his Grand Rapids, Mich., town hall, his first public event since becoming the first Republican to say Trump had engaged in impeachable conduct. But he also faced criticism from some Trump supporters, including at least one constituent who had supported Amash in the past.

Pro-Trump state Rep. Jim Lower announced he would mount a GOP primary bid against Amash shortly after Amash said he believed Trump committed impeachable offenses.

Lower acknowledged to The Washington Post on Tuesday that he had not read the Mueller report but believed it ended questions about Trump's conduct.

Amash defended his position on the Mueller report during his town hall.

"If you have a society where all we care about is that the other side is bad, and therefore we don't have to do the right thing, that society will break down, and you will have no liberty," Amash said. "I refuse to be a part of that."

But Amash, a founding member of the conservative House Freedom Caucus, so far has gone further on impeachment than House Democratic leaders. 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.) remains opposed to pursuing impeachment, instead preferring for committees to continue their investigations.

Yet nearly three dozen Democrats, including House Judiciary Committee members, have come out in support of impeachment in recent days.

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.), a Judiciary Committee member, tweeted after Mueller's statement on Wednesday that "Congress must act."

"For him to go on television and repeat it adds new urgency, putting it front & center before Congress & the American people. He's asking us to do what he wasn't allowed to—hold the president accountable," Demings tweeted.

Updated at noon.