Elon Musk called some Trump supporters "contemptible fools" as debate raged among Republicans about H-1B immigration visas. It echoed Hillary Clinton's "basket of deplorables" remark from the 2016 election about Trump voters.

Elon Musk doubled down on his support of H-1B visas after catching pushback from conservative figures. Donald Trump supported the program.

Trump's remarks followed a series of social media posts from Musk, the CEO of Tesla and SpaceX, who vowed late Friday to go to "war" to defend the visa program for foreign tech workers.