WASHINGTON (AP) — House Speaker Paul Ryan is refusing to support Donald Trump as the Republican nominee for president, insisting Thursday that the businessman must do more to unify the GOP. "For us to be a successful party, to climb that final hill and win the presidency, we will need a standard-bearer that can unify all Republicans, all conservatives, all wings of our party, and then go to the country with an appealing agenda that can be appealing to independents and disaffected Democrats," Ryan said.