In a potentially bombshell report, CNN reported Wednesday night that the FBI has information that suggests members of President Donald Trump’s team may have colluded with Russian operatives to coordinate the release of damaging information in an effort to torpedo Hillary Clinton’s presidential campaign.

CNN, basing its report on unnamed U.S. officials, said the evidence is largely circumstantial and is not yet conclusive, though the investigation is ongoing and is now focusing on the possibility of that collusion. The FBI’s information is based on “human intelligence, travel, business and phone records and accounts of in-person meetings,” CNN said.

Rep. Adam Schiff (D-Calif.) went a step further Wednesday, telling MSNBC “there is more than circumstantial evidence now” of collusion.

Clinton’s campaign was plagued by a steady stream of damaging information from emails allegedly stolen by Russian hackers that were later published by WikiLeaks.

On Monday, White House press secretary Sean Spicer said there was no evidence of any collusion between Trump’s campaign team and Russia. “Investigating it and having proof of it are two different things,” he said.

Trump Wiretapping Investigation Gets Complicated

A number of Trump associates’ ties to Russia are being investigated, including former campaign manager Paul Manafort, who has said he never worked for Russian interests. However, in a report Wednesday, the Associated Press said Manafort signed a $10 million contract with a pro-Putin Russian billionaire a decade ago to influence “politics, business dealings and news coverage inside the United States, Europe and former Soviet republics to benefit President Vladimir Putin’s government.”

Manafort denied the accusation as “smear and innuendo.”

Sen. John McCain (R-Ariz.) called the AP report “serious stuff” and again called for an independent investigation into Trump’s Russian ties. Speaking to MSNBC after Rep. Devin Nunes (R-Calif.), the House Intelligence chairman, briefed Trump on the investigation Wednesday in a breach of protocol, McCain said the House probe has lost its credibility

“It’s a bizarre situation, and what I think, the reason why I’m calling for this select committee or a special committee, is I think that this back-and-forth and what the American people have found out so far that no longer does the Congress have credibility to handle this alone,” McCain said to MSNBC’s Greta Van Susteren. “And I don’t say that lightly.”