The passivity of Republican senators in the face of Donald Trump’s behaviour remains a mystery if we reasonably assume there is a point at which personal political ambition runs into the hardened bunker wall of buried moral conviction.

Surely, we thought, traditional conservatives could no longer accept the amorality, the wanton fiscal irresponsibility, the challenge to their much-vaunted Christian values, that came to define the Trump presidency. Now, post-Trump, we still face that same difficulty as we try to figure out what it is that these Republicans believe that still makes them conservative. Is it a policeman being beaten by a thug wielding an American flag? A crowd gathered around a hastily-erected gallows, as they chant about hanging the Republican Vice-President? Is it the President threatening “revenge” on anybody who stands in his way?