ORLANDO, Fla. • Taking the stage for the first time since leaving office, former President Donald Trump on Sunday called for Republican Party unity, even as he exacerbated intraparty divisions and trumpeted lies about the election in a speech that made clear he intends to remain a dominant political force. Speaking at the Conservative Political Action Conference, where he has been hailed as a returning hero, Trump blasted his successor, President Joe Biden, and tried to cement his status as the party’s undisputed leader despite his loss in November. “Do you miss me yet?” Trump said after taking the stage, where his old rally soundtrack had been playing. “I stand before you today to declare that the incredible journey we begun together ... is far from being over.”