President Donald Trump has signed a national security memorandum establishing a new National Vetting Center within the Department of Homeland Security to better coordinate information on individuals who may pose a threat to the country. White House spokeswoman Sarah Huckabee Sanders says the effort will allow law enforcement “to better identify individuals seeking to enter the country who present a threat to national security.” She’s calling current vetting efforts “ad hoc” and says they impede the government’s ability to keep up with threats. …