A lifetime on and in front of the television, that hurried medium, trained Donald Trump in the art of the compressed jibe. Next to “l(fā)ow energy” and “l(fā)ittle Marco”, however, “l(fā)yin’ Ted” was a dud. It took supplemental strikes on Ted Cruz’s wife and father to sting the Texas senator, who called Mr Trump a “snivelling coward” in 2016.

On Monday, Mr Trump campaigned for Mr Cruz in Houston. There have been similar reconciliations with senators Rand Paul, who once called the president an “orange-faced windbag”, and Lindsey Graham, who, with Beckettian economy, went with “jackass”.

At this point, the done thing is to regret the moral capitulation of these one-time resisters. Less examined is the other side of the rapprochement. How easily Mr Trump comes to an understanding. For enemies, the price of re-admittance to his fold is the odd dose of flattery and votes for things they would have voted for anyway. Because he looks and talks like an immovable man, we miss evidence to the contrary.