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 Trump's 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.

Correction: This article has been updated to correct the description of the official who said the GOP memo is likely to be released on Thursday.