A string of tweets backing Mr Strange mysteriously disappeared as the result of the run-off became clear. ProPublica, which maintains a tally of all the president's deleted tweets, listed the evidence in black and white.

• Luther Strange has been shooting up in the Alabama polls since my endorsement. Finish the job - vote today for "Big Luther."

• Big election tomorrow in the Great State of Alabama. Vote for Senator Luther Strange, tough on crime & border - will never let you down!

• ALABAMA, get out and vote for Luther Strange - he has proven to me that he will never let you down! #MAGA