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

Sen. Chris MurphyChristopher (Chris) Scott MurphyThe fear of colorectal cancer as a springboard for change Dems shift strategy for securing gun violence research funds The Hill's 12:30 Report: O'Rourke jumps into 2020 fray MORE (D-Conn.) said Sunday that special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe 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 TrumpTrump mocks wind power: 'When the wind doesn't blow, just turn off the television' Pentagon investigator probing whether acting chief boosted former employer Boeing Trump blasts McCain, bemoans not getting 'thank you' for funeral 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 ManafortSenior Ukrainian official says he's opened probe into US election interference Mueller team asks court for delay, citing 'press of other work' Pollster says 'surprised' 37 percent of Republicans don't oppose Trump pardoning ex-associates 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.