(CNN) The nine Republicans on the House Intelligence Committee have signed a letter calling on House Intelligence Chairman Adam Schiff to resign as chairman, Rep. Mike Conaway, the Republican who led the panel's Russia investigation, said Thursday.

Conaway pointed to the release of the special counsel's summary on Sunday to accuse Schiff, a California Democrat, of having "abused your position to knowingly promote false information."

"Your actions both past and present are incompatible with your duty as chairman," Conaway said at the beginning of a public committee hearing on Russian money laundering, reading from the letter . "We have no faith in your ability to discharge duties."

The call from the Republicans on the committee for Schiff to step down escalate the Republican attacks on Schiff, who has come under fire for his claims of collusion after Attorney General Bill Barr's letter to Congress quoted special counsel Robert Mueller's report as saying it "did not establish that members of the Trump Campaign conspired or coordinated with the Russian government in its election interference activities."

President Donald Trump tweeted on Thursday morning that Schiff should resign from Congress.

Read More