WASHINGTON — Junk food for athletes? President Donald Trump’s offer of greasy burgers and fries to the college football champion Clemson Tigers brought a roasting from late-night TV hosts. Trump, a fast-food lover, said he paid for the meal himself because of the partial government shutdown, which has led to furloughs among federal workers, including at the White House. Otherwise, he joked, first lady Melania Trump and Karen Pence, Vice President Mike Pence’s wife, would be making salads. “I had a choice.