Democratic presidential hopeful Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE on Wednesday joined other Democrats in calling for Congress to begin impeachment proceedings 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.

The New Jersey senator endorsed the idea of impeachment shortly 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 addressed the findings of his two-year probe for the first time Wednesday.

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"Robert Mueller’s statement makes it clear: Congress has a legal and moral obligation to begin impeachment proceedings immediately," Booker tweeted.

"This Administration has continued to stonewall Congress’s oversight. Beginning impeachment proceedings is the only path forward," he added.

Robert Mueller’s statement makes it clear: Congress has a legal and moral obligation to begin impeachment proceedings immediately. — Cory Booker (@CoryBooker) May 29, 2019

Robert Mueller’s statement makes it clear: Congress has a legal and moral obligation to begin impeachment proceedings immediately. — Cory Booker (@CoryBooker) May 29, 2019 This Administration has continued to stonewall Congress’s oversight. Beginning impeachment proceedings is the only path forward. — Cory Booker (@CoryBooker) May 29, 2019

Booker weighed in shortly after Mueller held a press conference saying existing Justice Department guidelines prevented him from considering an indictment for Trump.

Mueller reiterated Wednesday that his investigation into Russian interference in the 2016 presidential election and possible obstruction of justice did not exonerate the president.

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

Booker joins a number of other 2020 White House rivals who have called for impeachment in the wake of Mueller's 448-page report released earlier this year.

Sens. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.) and Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.), former Housing and Urban Development Secretary Julián Castro and Miramar, Fla., Mayor Wayne Messam Wayne Martin MessamKey moments in the 2020 Democratic presidential race so far Wayne Messam suspends Democratic presidential campaign 2020 primary debate guide: Everything you need to know ahead of the November forum MORE have all come out in support of impeaching Trump. Several other candidates have deferred to the House about whether impeachment proceedings should begin without weighing in on the prospect one way or the other.

Mueller ultimately found insufficient evidence to charge Trump with conspiring with Moscow to interfere in the 2016 elections but declined to make a prosecutorial decision in his report about whether to the president obstructed subsequent investigations into the interference, outlining 10 “episodes” of behavior that was possibly obstructive.

Calls for impeachment from House Democrats grew after Mueller’s report was released in April. They have reached a near fever pitch in recent weeks as the White House fights off subpoenas from several committees for documents and testimony from a slew of current and former administration officials.

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 members of House leadership have so far been able to keep the impeachment push at bay, saying instead that Democrats should stay the course of investigating the White House and that any impeachment attempt would be quashed in the GOP-controlled Senate.

Updated at 12:15 p.m.