President Donald Trump’s promised crackdown on illegal immigration has begun to take shape in San Diego County, as federal agents launched targeted operations to arrest undocumented immigrants and a wave of military troops got to work reinforcing U.

A Border Patrol agent pats down one of four men after the group crossed the border illegally through a gap in two walls separating Mexico from the United States before turning themselves in, Thursday,

Officials said the fire, which had spread to more than 500 acres by Thursday night, was miles away from threatening any homes or buildings.

The Mexican government has criticized President Donald Trump’s unilateral immigration actions, and the landing would have required Mexico’s assistance.

U.S. officials say active duty military troops are arriving in El Paso, Texas, and in San Diego on Thursday evening.

Trump has repeatedly insisted that tariffs are coming on Canada and Mexico, despite both countries seeking to address his stated concerns about illegal border crossings and the smuggling of fentanyl. But the Republican president is also motivated by the idea that tariffs would force other countries to “respect” the United States.

CBS 8 spoke with Cal Fire San Diego on how crews battle fires that happen on the Mexico side of the U.S.-Mexico border.

"It's unprecedented," said Ciudad Juarez municipal official Enrique Licon as workers unloaded long metal bracings from tractor trailers parked in the large empty lot yards from the Rio Grande in order to build a tent city for deportees from the United States.

The search and advertising giant said it would change its Google Maps names to Mount McKinley and Gulf of America once they're officially changed by federal officials.

Our county budget and services are built on the strength of our economy. Any threat to our industries is a threat to the safety nets and resources we provide to San Diego’s families," Board of Supervisors Acting Chair Terra Lawson-Remer said in a statement.

San Diego Museum Month returns for its 36th year this Saturday, offering half-off admission to more than 70 locations throughout the month of February.