Rep. Adam Schiff, the top Democrat on the House Intelligence Committee, said Wednesday that there is “more than circumstantial evidence now” to suggest that President Donald Trump’s campaign may have colluded with Russia’s attempts to disrupt the election, but he would not offer details.

“I can tell you that the case is more than that,” Schiff told Chuck Todd on MSNBC. “And I can’t go into the particulars, but there is more than circumstantial evidence now.”

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When Todd followed up, asking if he had “seen direct evidence of collusion,” Schiff would not say so directly, but insisted that he has seen some “evidence that is not circumstantial” and is worth investigating.

“I don’t want to go into specifics, but I will say that there is evidence that is not circumstantial and is very much worthy of investigation, so that is what we ought to do,” Schiff said.

The FBI is currently investigating any links between the Trump campaign and Russia and whether the two parties coordinated with Russia’s suspected cyberattacks on Democratic Party officials before the election.

Trump and his aides have repeatedly denied any such wrongdoing. While Democrats have been raising questions about the president’s relationship with Russia for months, no public evidence has emerged to tie him or his associates directly to the cyberattacks.