Mark Warner, the Democratic senator from Virginia and vice-chairman of the Senate Select Committee on Intelligence (SSCI), known for his moderation and discretion, has stepped up his offensive rhetoric about Donald Trump's intelligence policy.

He is even looking to address the public directly, as he did on 19 September at the Hayden Centre at George Mason University, in front of an audience of students and intelligence veterans.

His clash with Laura Loomer, a far-right conspiracy theorist and influencer,