Donald Trump. Pic/AFP

US President Donald Trump has inspected prototypes for his long-promised wall along the border with Mexico in a tour that drew both supporters and protesters. "If you don't have a wall system here, we're not gonna have a country," Trump warned while touring the eight prototypes of the wall he promised to build to keep out illegal immigrants near San Diego in the state of California. His inspection on Tuesday, of the prototypes made of concrete, steel and other materials marks his first visit to California since assuming office, Xinhua news agency reported.