The Department of Homeland Security moved quickly to implement a slew of President Donald Trump's immigration initiatives.

U.S. President Donald Trump on Monday signed executive orders declaring illegal immigration at the U.S.-Mexico border a national emergency, designating criminal cartels as terrorist organizations, and targeting automatic citizenship for U.

The orders include declaring a national emergency to deploy military personnel to the border, suspending refugee resettlement and ending birthright citizenship.

“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.

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.

The White House signaled plans for executive orders, including ending birthright citizenship for children of illegal immigrants.

From one order tackling the definition of birthright citizenship, to another declaring illegal immigration at the border a national emergency, Trump swiftly made moves on his promises to tighten the US-Mexico border.

By Ted Hesson, Alexandra Ulmer WASHINGTON/PIEDRAS NEGRAS, Mexico (Reuters) -Newly sworn-in U.S. President Donald Trump said on Monday he will declare illegal immigration at the U.S.-Mexico border a national emergency,