The investigation activity described so far is “stunningly normal,” Hayden said on ABC’s “This Week.” From “everything I know, everyone has handled this just about the way it should have been handled,” he added.

The president is “simply trying to delegitimize the Mueller investigation … and he’s willing to throw almost anything against the wall” to do that, Hayden said. He pointed out that a previous Trump claim against investigators — that Trump Tower was wiretapped at Obama’s request — turned out to be absolutely untrue.

Trump has insisted that the FBI embedded a “spy” in his presidential campaign team at the behest of Barack Obama. In fact, in standard procedure, an informant contacted two members of Trump’s campaign to investigate legitimate suspicions that members may have been compromised by Russian spies, The New York Times reported.