Trump says lax migration policies are top national security threat after National Guard members shot

President Donald Trump said Wednesday's “heinous assault” on two National Guard members near the White House proves that lax migration policies are “the single greatest national security threat facing our nation." Trump’s remarks, released in a video on social media, underscores his intention to reshape the country’s immigration system and increase scrutiny of migrants who are already here. The suspect in the shooting is believed to be an Afghan national, according to Trump and two law enforcement officials.