The whistle-blower said Mr. Flynn thought that ending the sanctions would allow a business project he was once involved with to move forward.
Christopher A. Wray, the F.B.I. director, did not mention the president in defending the agency’s work force as “focused on our critical mission.”
President Trump’s former aide had told lawmakers that she knew nothing of the national security adviser’s contacts with the Russian ambassador. But newly surfaced emails undermine her assertion.
President Trump’s tweet that he knew his former national security adviser had lied to the F.B.I. is seen by some as evidence that he obstructed justice. But his lawyer says a president cannot violate such laws.
In an extraordinary attack on the top law enforcement body in his own government, Mr. Trump accused the F.B.I. and its career investigators of having a bias against him.
In a statement, the network said the reporting “had not been fully vetted through our editorial standards process” and apologized for the “serious error.”