Trump’s doomsday scenario: a Haley upset with a DeSantis exit after Iowa

Iowa will decide whether the Republican race stretches into February or wraps up Monday night

Behind the scenes, some of Donald Trump’s advisers have been warning the former president and de facto Republican nominee to guard against a doomsday scenario, one in which the Republican race turns into a surprise two-person contest between himself and former U.N. Ambassador Nikki Haley. 

The Trump doomsday hypothetical works like this: Haley beats Flor…