Donald Trump shakes hands with Herschel Walker in New York after making an agreement on a 4-year contract with the New Jersey Generals USFL football team, on March 8, 1984.Dave Pickoff/The Associated Press
As a student, Donald Trump played high school football. As a business baron, he owned a team in an upstart rival to the NFL and then sued the established league. As president, he denigrated pros who took a knee during the national anthem as part of a social justice movement.
On Sunday, he adds to that complicated history with the sport when he becomes the first president in office to attend a Super Bowl.
Trump’s appearance at the Superdome in New Orleans to watch the two-time defending champion…