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 (D-Calif.) called Wednesday for Jared Kushner and Paul Manafort, as well as Donald 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 Jr. and everyone in the Trump campaign who helped organize a meeting with a Russian lawyer last year, to testify before Congress.

Schiff, the ranking member of the House Intelligence Committee, which is investigating any potential collusion over Russian election meddling, said on “CBS This Morning” that, though he expects the Trump administration to claim that they had “no intent to collude” with the Russian government, it’s “not much of a defense.”

“I think we need to do a lot to corroborate some of the evidence we've received before we can draw any conclusions," Schiff said.

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Trump Jr. on Tuesday released email interactions that detailed his meeting with a Russian lawyer who promised damaging information on 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 last year in the prime of the Trump’s campaign against her.

Schiff said Trump Jr., Manafort and Kushner, who is a senior adviser in the White House, made it clear that they were expecting damaging information and that they would welcome help from the Russian government.

"You have three central campaign people, indeed three of the most important in the Trump campaign, who go to this meeting with the full expectation of getting help from the Russian government and indeed have sent a signal to the Russian government they would welcome it, they would indeed love it," he said.

He said a potential conspiracy to violate U.S. election laws is a “very real issue” for the House Intelligence panel.

The lawmaker added that he would like to know if Trump Jr. and Trump campaign officials had coordinated with Russia over the timing of false news stories that were released last year, adding that the detail would be “significant.”

"In those emails, it's very significant that Donald Jr. said it would be most helpful to get this information in the late summer, he's already talking about timing," Schiff said.