President Trump may be having an extramarital affair in the White House, according to the latest bombshell claim from “Fire and Fury” author Michael Wolff. Wolff said Friday on HBO’s “Real Time with Bill Maher” that he was “absolutely sure” of such a tryst, but acknowledged that he lacked “ultimate proof.” “I didn’t have the blue dress,” Wolff told Maher, referring to the key piece of evidence from Bill Clinton’s notorious Oval Office dalliance with Monica Lewinsky. The author said he’d even planted a clue in his controversial best-seller. “You’ll know it,” he said. “Now that I’ve told you, when...