Donald Trump vows to track illegal immigrants on visas

US Republican presidential candidate Donald Trump has offered fresh details of how he would tackle illegal immigration, saying he would crack down on those who overstay their visas as he sought to quiet criticism from conservatives.

In a campaign speech in Des Moines, Iowa, Trump also cited the shooting death of a cousin of NBA star Dwyane Wade to urge African-American voters to rally behind him, calling it an example of violence that has to be addressed.

Trump said he would seek to institute a tracking system to ensure illegal immigrants who overstay their visas are quickly removed, and would propose an e-verify system to prevent the illegal community from gaining access to welfare and other benefits.