"Go ahead. Get your 2 hour debate," wrote Walmart, with the hashtag #soreloser.

"Thanks ?@Walmart ?for your insulting condescension," shot back the Missouri Republican, adding "Now that you've insulted 75 million Americans, will you at least apologize for using slave labor?"

Hawley followed it up with "Or maybe you'd like to apologize for the pathetic wages you pay your workers as you drive mom and pop stores out of business."