WATCH: Law and Order at CPAC

Under the U.S. Constitution, Congress has the authority to establish rules on who gets to enter the country, why, and for how long. President Donald Trump’s job, as the country’s chief executive, is to execute those laws, to carry out those laws.

What President Trump is talking about in terms of limiting immigration is already codified as existing law. Watch Sheriff David Clarke’s brief clip at CPAC for more:

.@SheriffClarke: “@POTUS has made it very clear that it is high time… that we start aggressively enforcing the rule of law.” #CPAC2017 pic.twitter.com/EpwZnmYjxc

— Fox News (@FoxNews) February 24, 2017