The New York Times reports "Trump Ordered Mueller Fired, but Backed Off When White House Counsel Threatened to Quit [nytimes.com]":
President Trump ordered the firing last June of Robert S. Mueller III, the special counsel overseeing the Russia investigation, according to four people told of the matter, but ultimately backed down after the White House counsel threatened to resign rather than carry out the directive.
Mueller Investigation: Three Former Trump Aides Charged [soylentnews.org]
Michael Flynn Pleads Guilty to Lying to the F.B.I. [soylentnews.org]
UK Election Results; Fired FBI Director's Testimony on Trump; Trump Nominates New FBI Director [soylentnews.org]