Federal officials have installed surveillance equipment at the construction site of prototypes for President Trump’s proposed wall along the U.S.-Mexico border to help safeguard the project against a “threat environment,” The Los Angeles Times reported on Tuesday.

Customs and Border Protection (CPB) officials ordered video surveillance be installed to “provide situational awareness related to threats against the site and against the contractors building the prototype walls,” according to the Times.

The prototypes were built near San Diego. Construction was completed in late October, and the CPB commenced a testing phase.

The cost of the surveillance equipment is unknown, and it was approved under a no-bid process because officials determined the system was required immediately, the newspaper reported.

The construction of a border wall between the U.S. and Mexico has been a pillar of Trump’s agenda since he began his presidential campaign.