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

Sen. Chris MurphyChristopher (Chris) Scott MurphyOn The Money: Senate braces for nasty debt ceiling fight | Democrats pushing for changes to bipartisan deal | Housing prices hit new high in June Democrats pushing for changes to bipartisan infrastructure deal House bill targets US passport backlog MORE (D-Conn.) said Sunday that special counsel Robert MuellerRobert (Bob) MuellerSenate Democrats urge Garland not to fight court order to release Trump obstruction memo Why a special counsel is guaranteed if Biden chooses Yates, Cuomo or Jones as AG Barr taps attorney investigating Russia probe origins as special counsel 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 TrumpNew Capitol Police chief to take over Friday Overnight Health Care: Biden officials says no change to masking guidance right now | Missouri Supreme Court rules in favor of Medicaid expansion | Mississippi's attorney general asks Supreme Court to overturn Roe v. Wade Michael Wolff and the art of monetizing gossip 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 ManafortFormer bank CEO convicted of bribery in scheme to land Trump admin job Trial begins for Chicago banker who exchanged loans with Manafort for Trump job Legal intrigue swirls over ex-Trump exec Weisselberg: Five key points 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.