Media mogul Rupert Murdoch took a none-too-subtle shot at Donald Trump Tuesday evening, suggesting on social media that the GOP front-runner is perhaps a bit too thin-skinned to compete for the party's nomination.

"Donald Trump seems to be getting even more thin skinned! Is flying around the country every day tiring him?" Murdoch asked his more than 680,000 followers on Twitter. "Would anybody else."

His remarks came at around the same time that former Florida Gov. Jeb Bush appeared to get under the casino tycoon's skin by confronting him with previous foreign policy statements that failed to hold up over time.

"Look, two months ago Donald Trump said that ISIS was not our fight. Just two months ago he said that Hillary Clinton would be a great negotiator with Iran," Bush said. "And he gets his foreign policy experience from the shows.

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