Rep. Adam Schiff Adam Bennett SchiffTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies MORE (Calif.), the top Democrat on the House Intelligence Committee, said the committee has much more information about the ongoing investigations into Russian meddling in the 2016 presidential election than what has been reported publicly.

"There's an awful lot more [intelligence] than that's even in the public domain," Schiff said on MSNBC's "Morning Joe."

Schiff responds to Don Jr.'s tweet: There's an awful lot more intel than what's in the public domain. (via @Morning_Joe) pic.twitter.com/C454nTAmju — Kyle Griffin (@kylegriffin1) July 11, 2017

Schiff's comments came in response to a tweet from Donald Trump Jr., who slammed Democrats and the media for "desperation" for covering a meeting he had in June 2016 with a Russian lawyer with Kremlin ties who promised him compromising information on Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE's campaign.

Media & Dems are extremely invested in the Russia story. If this nonsense meeting is all they have after a yr, I understand the desperation! — Donald Trump Jr. (@DonaldJTrumpJr) July 11, 2017

Schiff dismissed Trump Jr.'s claims, saying he continues to have "evolving accounts."

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"But of course, the evolving accounts from Don Jr. don't inspire a lot of confidence for someone who was very adamant: never had any one of these meetings, never had any kind of help or offers of help," the California lawmaker said.

"This is preposterous. He was making the same argument before. Of course, he's had to evolve his story many times since then. I'm sure it'll evolve many times in the future, so I don't give that a whole lot of credit."

Trump Jr. met with Russian lawyer Natalia Veselnitskaya in June 2016 at Trump Tower after she promised to provide damaging information on Clinton, The New York Times reported Monday. Paul Manafort, President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE's campaign chairman at the time, and Jared Kushner, Trump's son-in-law who is now a senior White House adviser, also attended the meeting.

Trump Jr. said that he did not receive any compromising information about Clinton.

“Her statements were vague, ambiguous and made no sense. No details or supporting information was provided or even offered. It quickly became clear that she had no meaningful information,” Trump Jr. said in a statement.

He has also downplayed the meeting on Twitter Monday, saying he is not the first person to seek damaging information on a political opponent.

The Kremlin denied knowledge of the meeting or any connection to Veselnitskaya on Monday.