In a letter to U.S. congressional leaders, the governor blamed previous border security policy for leaving Texas “defenseless,” forcing state officials to spend billions.

The new president said he would designate drug cartels terrorists and send troops to the southern border to repel an “invasion," even as crossings are at a low.

WASHINGTON — President Donald Trump will declare a national emergency, send troops to the southern border, deport undocumented immigrants en masse and reinstate a policy requiring asylum seekers to wait their cases in Mexico — and Gov. Greg Abbott will be a key partner, he said during his inauguration on Monday.

The new president said he’ll work with Abbott to quickly build the border wall and crack down on illegal immigration.

Read more <a href=" Only minutes after being sworn in as the 47th President of the United States, President Donald Trump praised Texas Gov. Greg Abbott’s border security policies and promised Texas would have support from Washington now that he was in office.

The speech underscored President Trump's continued focus on immigration, which he called the nation's "number one issue."

All eyes were on Monday's presidential inauguration speech as Donald Trump became the 47th President of the United States of America.

Abbott’s appearance will come just a week after he joined other Republican governors around the nation at Trump’s Mar-a-Lago resort.

Texas Gov. Greg Abbott announced that flags at the state Capitol in Austin and all state office buildings will be raised to full-staff on Jan. 20, to mark President-elect Trump's inauguration.

Governor Abbott of Texas congratulates President Trump upon his inauguration, expressing optimism for America's future.

Gov. Greg Abbott announced he has ordered all flags to be raised to full staff at the Texas Capitol and all state buildings on Monday, Jan. 20, the day President-elect Donald Trump is set to be inaugurated as the 47th President of the United States.

President Donald Trump's inauguration marks a major change ... delivering an enthusiastic endorsement of Texas Gov. Greg Abbott's border policies while pledging to continue construction of the ...