The Biden administration quietly announced plans on Thursday to add to the border wall with Mexico — extending construction of the barrier that was a signature policy of Donald Trump.

Homeland Security Secretary Alejandro Mayorkas said in a notice in the US Federal Register there was "an acute and immediate need to construct physical barriers and roads in the vicinity of the border of the United States in order to prevent unlawful entries."

The new section of wall will be built in the "high illegal entry" Rio Grande Valley Sector of the US-Mexico border, Mayorkas said, where there have been more than 245,000 illegal entrants this fiscal year.

President Joe Biden announced in a proclamation on the day he took office in January 2021 that no more taxpayer funds would be allocated to build a border wall.

"Building a massive wall that spans the entire southern border is not a serious policy solution," Biden said.

Mayorkas said the funding for the "additional physical barriers" would come from an appropriation made by Congress for that purpose in 2019, when Trump was still in office.

The Department of Homeland Security said some two dozen federal laws such as the Clean Air Act and Endangered Species Act would need to be waived to allow for the extension of the border wall.

Illegal immigration has become a major political issue for Biden, with opposition Republicans accusing him of lax border policies.

Trump, the frontrunner for the 2024 Republican presidential nomination, said the Biden administration move showed "I was right when I built 560 miles… of brand new, beautiful border wall."

"Will Joe Biden apologize (sic) to me and America for taking so long to get moving, and allowing our country to be flooded with 15 million illegals immigrants, from places unknown," Trump said in a post on his Truth Social platform.