Trump isn't building new wall like he promised made of concrete, he's just replacing existing barrier with bollard fencing.
ALBUQUERQUE, N.M.- President Trump tweeted about the completion of a "powerful wall" in New Mexico. The steel wall was built in Santa Teresa. It replaced fencing that was used to prevent vehicles from crossing. According to the Washington Examiner, the money for the project came from the congressional budget in May 2017. The Washington Examiner reports the barriers are 18 to 30 feet high.