Dem senator: We've entered a 'new phase' in Mueller investigation

Sen. Chris MurphyChristopher (Chris) Scott MurphyHobbled NRA shows strength with Trump Overnight Defense: US, Russia tensions grow over nuclear arms | Highlights from Esper's Asia trip | Trump strikes neutral tone on Hong Kong protests | General orders ethics review of special forces White House eyes September action plan for gun proposals MORE (D-Conn.) said Sunday that special counsel Robert MuellerRobert (Bob) Swan MuellerMueller report fades from political conversation Trump calls for probe of Obama book deal Democrats express private disappointment with Mueller testimony MORE's investigation into alleged collusion between the Trump campaign and Russia has moved into a "new phase" after new documents were released to the public.

Murphy suggested the new phase is headed toward impeachment, comparing President TrumpDonald John Trump Former US ambassador: 'Denmark is not a big fan of Donald Trump and his politics' Senate Democrats push for arms control language in defense policy bill Detroit county sheriff endorses Booker for president MORE to former Presidents Clinton and Nixon. 

"We have reached a new level in the investigation. The special counsel is starting to show his cards and these are very serious allegations," Murphy told ABC's "This Week."

"This is a president who's now named as an unindicted co-conspirator," Murphy said, referring to a filing in the case of Trump's former personal attorney Michael Cohen that implicates Trump in directing Cohen on illegal campaign contributions. "The allegation is that he committed at least two felonies to try to manipulate the 2016 election."

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Murphy added that it is important that Congress has "all of the facts."

"I think you are beyond the stage that led to impeachment proceedings against President Clinton," Murphy said. "I still think it's important for Congress to get all of the underlying facts and data and evidence that the special counsel has before we make that determination."

Murphy said that's why Congress needs Mueller's report "as soon as possible."

"We certainly have moved into a new phase," Murphy added. "The president has now stepped into the same territory that ultimately led President Nixon to resign the office. President Nixon was an unindicted co-conspirator."

"Certainly a different set of facts, but this investigation is now starting to put the president in serious legal crosshairs," he added.

On Friday, Mueller released a heavily redacted filing that detailed the special counsel's claim that former Trump campaign chairman Paul ManafortPaul John ManafortTrial of ex-Obama White House counsel suddenly postponed Top Mueller probe prosecutor to join Georgetown Law as lecturer DOJ releases notes from official Bruce Ohr's Russia probe interviews MORE violated his plea agreement by lying to federal prosecutors.  

Federal prosecutors in New York also said Friday that Cohen was directed by the president to pay off two women who claimed to have had affairs with Trump in order to prevent negative press coverage, violating campaign finance law in the process.