The US Marines reinforced the Trump border wall with razor wire as part of the government's ongoing crackdown on crime.

Footage shows authorities installing barbed fencing along the southern border wall near Otay Mesa in San Diego, California, on March 7.

The effort, in collaboration with US Northern Command and the Department of Homeland Security, aims to strengthen security and reduce illegal crossings by adding more physical barriers.

Trump, known for his hardline nationalist and anti-immigrant rhetoric, has promised a sweeping crackdown on undocumented and illegal immigrants in the country.

On his first day of office, he declared a 'national emergency' at the southern border with Mexico.

He has also issued a memo telling the US Agency for International Development to adopt an 'America First' policy, threatening sanctions on staff who refuse to obey.

Dozens of deportation flights have also taken off, sending illegals back to their homeland in handcuffs.

In contrast to the bid to oust illegals, Trump is vying to replace them with millionaires who will buy 5 million USD 'gold cards' to gain residency and citizenship.