Top Democrats on the Senate Foreign Relations Committee said Thursday that they have not yet seen any evidence that the Donald Trump campaign colluded with the Russians during the 2016 election, even as hearings meant to probe the unsubstantiated claims dominate Capitol Hill.

“I think, uh. I haven’t seen the evidence because it hasn’t been made public,” Sen. Jeanne Shaheen of New Hampshire told The American Spectator during recess in a Foreign Relations Committee hearing featuring Madeleine Albright. “So I’m waiting to see what the intelligence committees come up with.”

“Um, the investigation is ongoing,” Sen. Tim Kaine of Virginia told The American Spectator, declining to confirm that he has seen any evidence.

“Well, I think there’s a bunch of really really suspicious contacts” Sen. Tom Udall of New Mexico told The American Spectator. “And the timing, and the contacts, it doesn’t look good for them. It looks very very suspicious.”

Pressed on evidence, Udall confirmed that he has not seen definitive proof. “There is significant evidence that there were a number of contacts, and the question is, what was said? It looks very suspicious.” Democrats have been focusing on the fact that Attorney General Jeff Sessions, a Trump campaign surrogate, met with the Russian ambassador at the Republican National Convention at an event set up by the Obama State Department and co-sponsored by the Heritage Foundation.

“That’s why they’re having the committee hearings today, and I haven’t seen the results of the committee hearings yet,” Sen. Tom Carper of Delaware said. “And I haven’t seen the results of the committee hearings yet.”

“I’m going to my hearing,” Sen. Cory Booker of New Jersey told The American Spectator, laughing nervously.

Sen. Ben Cardin of Maryland, the top Democrat on the Foreign Relations Committee, would not answer The American Spectator‘s repeated questions about the lack of evidence, even though he stated in the hearing in no uncertain terms that “Russia sought to undermine and interfere in our elections.”

Both the Senate Foreign Relations and Intelligence Committees convened hearings Thursday to investigate the Trump-Russia suspicions, which so far have not been backed up by a single piece of incontrovertible evidence.