Rep. Eric Swalwell, D-Calif., said Monday he's ready for President Trump to sue him because he refuses to back down from his public assertions that there was evidence of collusion between Trump's campaign and Russia.

During an interview on MSNBC, the California Democrat was asked to respond to a Trump re-election campaign memo asking TV producers to challenge their guests, including Swalwell, who in the past said there was proof of collusion. The memo was sent after Attorney General William Barr released a summary of special counsel Robert Mueller's investigation which was unable to determine there was collusion between members of Trump's team and the Kremlin.

"To that I would say the only person who has made false statements about Russia is Donald Trump," Swalwell said on MSNBC. "And I stand by what I said about seeing evidence of collusion and if he has a problem with that, he can sue me. And I promise you I would win in court."

[Opinion: The collusion delusion]

Swalwell, a member of the House Intelligence Committee, is quoted in the memo from a March 2018 interview on CNN saying, "In our investigation, we saw strong evidence of collusion." He was referring to his panel's Russia investigation. That inquiry took place when the House Intelligence Committee was in GOP control and concluded last February there was no collusion.

Democrats complained that the investigation wrapped up prematurely, and now that the committee is being led by Rep. Adam Schiff, D-Calif., another person who has argued there is evidence of Trump-Russia collusion, a revamped investigation into Trump and people around him is underway.