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Donald Trump.
"Joe Scarborough initially endorsed Jeb Bush and Jeb crashed, then John Kasich and that didn't work," Trump tweeted. "Not much power or insight!"
"I hear @JoeNBC of rapidly fading @Morning_Joe is pushing hard for a third party candidate to run," he posted moments later. "This will guarantee a Crooked Hillary win."
Scarborough, who's been accused of having a cushy relationship with the bombastic billionaire, shot back soon after.
"Define 'rapidly fading,' Donnie boy," he tweeted.
On Friday morning's edition of "Morning Joe," Scarborough was part of a panel discussion about the possibility of a third-party alternative to Trump and Hillary Clinton, the Democratic frontrunner.
"There is not a better time for someone to run as an Independent candidate," Scarborough offered.