Federal officials have issued formal requests for the designs of wall prototypes, to be built in the peak summer heat along the U.S.-Mexico border.

Work begins on border barrier replacement project in San Diego Construction to replace a barrier along a 14-mile stretch of the U.S.-Mexico border east of San Diego began Friday.

A Hispanic-owned firm in the United States — whose workers have been threatened for doing security projects along the Mexico border — is chosen to build a border wall prototype.