Elon Musk called President Donald Trump's trade adviser Peter Navarro "truly a moron" and "dumber than a sack of bricks" on Tuesday. Musk, a top White House adviser on federal spending cuts, was responding to comments made by Navarro on CNBC about how Tesla makes its cars.

I’ve been called worse,” the White House trade adviser said after the Tesla boss called him “dumber than a sack of bricks.”