U.S. President Donald Trump delivers his State of the Union address to a joint session of the U.S. Congress on Capitol Hill in Washington, U.S. January 30, 2018. REUTERS/Leah Millis

WASHINGTON (Reuters) - A Republican memo alleging anti-Trump bias at the FBI and U.S. Justice department is likely to be released on Thursday, an official of President Donald Trumps administration said on Wednesday.

The FBI said earlier on Wednesday it had “grave concerns” about the accuracy of the top-secret House Intelligence Committee memo, challenging President Donald Trump’s pledge to release it.

(This version of the story corrects source to Trump administration official)