Stretches of secondary fencing are topped with spirals of concertina wire along the U.S.-Mexico border between the San Ysidro and Otay Mesa ports of entry, in San Diego on Aug. 16, 2017. Border Patrol agents use the frontage road between this and primary fencing to patrol for immigrants attempting to enter the U.S. illegally. (Brandon Quester/inewsource)
Stretches of secondary fencing are topped with spirals of concertina wire along the U.S.-Mexico border between the San Ysidro and Otay Mesa ports of entry, in San Diego on Aug. 16, 2017. Border Patrol agents use the frontage road between this and primary fencing to patrol for immigrants attempting to enter the U.S. illegally. (Brandon Quester/inewsource)

As it stands today, the wall is imperfect. It’s also new. Almost 90 percent of what is there today was built in the past 12 years under Republican President George W. Bush and Democratic President Barack Obama, based on an analysis by KPBS and inewsource using newly released data.

Jean Guerrero is a reporter at KPBS.

Leonardo Castañeda was a reporter and economic analyst for inewsource. To contact him with tips, suggestions or corrections, please email leocastaneda [at] inewsource [dot] org.