Foreign leaders have rushed to ingratiate themselves with Donald J. Trump in recent days, nervously recalling the clashes, insults and feuds of his first presidency.

© Jesco Denzel/German Federal Government, via Associated Press

Foreign leaders have rushed to ingratiate themselves with Donald J. Trump in recent days, nervously recalling the clashes, insults and feuds of his first presidency.

What will happen after Tuesday to Trumpism and the G.O.P. if Donald Trump wins — or loses?