Trump wants to 'ideology test' émigrés from troubled spots
Iran 'dominant regional power' after nuclear deal, GOP nominee says.
Republican presidential candidate Donald Trump speaks at a caucus night watch party at the Treasure Island Hotel & Casino on February 23, 2016 in Las Vegas, Nevada.(photo credit: ETHAN MILLER / GETTY IMAGES NORTH AMERICA / AFP)ByMICHAEL WILNERUpdated: