Now, it's Rand Paul's turn for a whirl on Donald Trump's spit.
The billionaire businessman currently leading the field of Republican presidential candidates took to Twitter on Monday night with Paul, the Kentucky senator, in his sights:
Truly weird Senator Rand Paul of Kentucky reminds me of a spoiled brat without a properly functioning brain. He was terrible at DEBATE!— Donald J. Trump (@realDonaldTrump) August 11, 2015
The social media missive, the latest in an almost daily series from @realDonaldTrump, came after Paul told reporters on a Monday conference call that he'd had enough of Trump's "fat jokes and stupid jokes" in this 2016 presidential campaign.
Paul labeled Trump an "empty suit" and a "bully," MSNBC reported.
"If no one stands up to a bully, a bully is going to keep doing what they're doing," Paul said.
"Unless someone points out that the emperor has no clothes, they'll continue to strut about and what we'll end up with is a reality TV star as nominee, if we're not careful."