The two terrorist attacks six weeks apart in New York City carried out by two recent immigrants were swiftly contained and the suspects arrested. But the political consequences instantly started reverberating. Akayed Ullah, 27, a green card holder from Bangladesh who is accused of detonating a bomb in a subway tunnel on Monday, came to the United States on what is known as an F43 visa, available to the nieces and nephews of U.S. citizens. Sayfullo Saipov, 29, from Uzbekistan, won his visa in a diversity lottery intended to bring immigrants from underrepresented countries to the United States. The Trump...