State and local leaders across the country are bracing for a tidal wave of aggressive immigration policies and possible mass deportations that President Donald Trump has vowed to enact in the hours and days following his inauguration Monday.

WASHINGTON - 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.

“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.

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

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”.

The executive orders will include deploying U.S. troops to the southern border, and ending birthright citizenship for children of illegal immigrants.

President Donald Trump’s plans to curb immigration and beef up border security began taking effect soon after he was inaugurated Monday as he made good on campaign promises.

President Donald Trump has promised a wave of deportations, which has caused fear and anxiety in New York City.

Immigrants rights groups are already contesting President Trump's sweeping executive orders aimed at combating illegal immigration.

U.S. President Donald Trump on Monday issued a flurry of executive orders and directives as he sought to put his stamp on his new administration on matters ranging from energy to criminal pardons and immigration.

Senate passage gives Trump a legislative victory on his first day back in the White House and jump-starts his sweeping agenda to curb illegal immigration.