U.S. President Donald Trump walks on South Lawn upon his return to the White House in Washington, U.S., from Greenbrier, WV, February 1, 2018. REUTERS/Yuri Gripas

WASHINGTON (Reuters) - President Donald Trump on Friday approved the release of a classified Republican memo that alleges anti-Trump bias at the FBI and Justice Department, sending the document back to a congressional committee that may make it public, Fox News reported.

The four-page memo has been declassified and its release was expected later on Friday, Fox reported, citing unidentified sources.