Tuesday's attack in New York City prompted President Donald Trump to renew his calls for extreme vetting of immigrants. On Tuesday afternoon, an Uzbeck national allegedly drove a truck down a bike path in New York, killing at least eight people. During a White House Cabinet meeting today, the president said he is starting the process to end the diversity lottery system. On Wednesday, he tweeted that the man allegedly responsible for yesterday’s attack came into the U.S. as part of the diversity lottery program. In the wake of the attack, the president also tweeted that he wants to step up the extreme vetting program in immigration policy. We talk to an expert about these suggested changes to U.S. immigration policy and politically viable they are.