Premise: U.S. President Donald Trump on Monday called for tighter restrictions on immigration in the wake of the terrorist attack in New York City carried out by a Bangladesh native living in the U.S. "America must fix its lax immigration system, which allows far too many dangerous, inadequately vetted people to access our country," Trump said in a written statement quoted by USA Today.
Hypothesis: U.S . President Donald Trump proposed regulation in the existing immigration policies so as to perform the strict  background checkup of the immigrants and to allow only adequately vetted immigrant to the country.