The order will deploy 1,500 troops to build physical barriers, but they will not be used for law enforcement, a military official says.

President Donald Trump has promised swift action on immigration, asylum and border security as he takes office today.

President Donald Trump's administration has directed U.S. prosecutors to criminally probe local officials who resist immigration enforcement efforts, intensifying a sweeping crackdown that Trump launched the day he took office.

In his third day in office, President Donald Trump signed more executive orders aimed at shutting down the U.S. southern border to immigration and ramping up deportations — though large scale deportation raids had yet to materialize as of Wednesday afternoon.

“Today, I will sign a series of historic executive orders. With these actions, we will begin the complete restoration of America, and the revolution of common sense,” said Trump, who at midday Monday became only the second U.S. president to serve nonconsecutive terms, after Grover Cleveland in the late 1800s.

Acting Deputy Attorney General Emil Bove said that local laws that don't match Trump's immigration plans threaten national security.

As President Donald Trump delivered his inaugural address on Monday, he outlined the series of executive orders he planned to sign that day to "begin the

Newly sworn-in U.S. President Donald Trump said on Monday that he would declare illegal immigration a national emergency, send troops to the U.S.-Mexico border, and reinstate his "remain in Mexico" policy as part of a sweeping immigration crackdown.

"My office is a law enforcement entity. We are going to follow the Constitution and uphold the law," Krasner said as Trump officials threatened consequences for uncooperative local officials.

The bill would require law enforcement to detain immigrants without legally status arrested for crimes such as theft and shoplifiting.

The notion that America is being invaded has become the defining theme of Mr Trump’s immigration policy. Hours after his inauguration the president issued ten executive orders on immigration and border enforcement “to repel the disastrous invasion of our country”.

"Every other state has provided resources and funding to help secure the border, and my border has been absent of that," Rep. Jenifer Johns said.