Donald Trump just had a big win, but he might be about to fall into a trap, a conservative economist said Saturday. Oren Cass, who previously flagged concerns with Trump’s political campaign, wrote in the New York Times over the weekend that suggests the former president and president-elect might make a decision that could ultimately doom his presidency. In a piece titled, “Trump Is About to Face the Choice That Dooms Many Presidencies,” Cass, the chief economist at American Compass, a conservative economic think tank, said “Trump is experiencing a sudden role reversal.” Want more breaking pol…