President Donald Trump has threatened his former chief strategist Steve Bannon with legal action over defamatory statements in a new book about an infamous meeting Trump and amp;#39;s son and son-in-law held with Russian lawyers during the 2016 US presidential campaign. Asked if he felt betrayed by Bannon, Trump told reporters on Thursday (4 January): He called me a great man last night, so... he obviously changed his tune pretty quick.