Donald Trump’s campaign has called out Florida Gov. Ron DeSantis in a new TV ad for “attacking” the former Republican president and one-time ally — and suggested the governor should drop out of the race before he even gets in. “Ron DeSantis was struggling big time in his primary race for governor of Florida,” says the ad’s narrator, referring to the 44-year-old’s first gubernatorial run in 2018. “Polls revealed DeSantis was failing so bad, he was losing by a staggering 17 points,” the narrator adds. “Then DeSantis was saved by the endorsement of President Trump. “Trump’s support was so powerful,...