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

Sen. Chris MurphyChristopher (Chris) Scott MurphyOvernight Defense: Trump clashes with Macron at NATO summit | House impeachment report says Trump abused power | Top Dem scolds military leaders on Trump intervention in war crimes cases Trump administration releases 5M in military aid for Lebanon after months-long delay Senate Democrats ask Pompeo to recuse himself from Ukraine matters MORE (D-Conn.) said Sunday that special counsel Robert MuellerRobert (Bob) Swan MuellerTrump says he'll release financial records before election, knocks Dems' efforts House impeachment hearings: The witch hunt continues Speier says impeachment inquiry shows 'very strong case of bribery' by Trump 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 TrumpTrumps light 97th annual National Christmas Tree Trump to hold campaign rally in Michigan 'Don't mess with Mama': Pelosi's daughter tweets support following press conference comments 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 ManafortGiuliani meets with fired Ukrainian prosecutor who pushed Biden, 2016 claims: report Top State Department official tells senators he has not seen evidence of Ukrainian interference Justice Dept releases another round of summaries from Mueller probe 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.