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US Secretary of State Marco Rubio indicated last week that Cuba's leaders should be worried, saying that he would be "concerned" if he were in the Cuban government and that "they're in a lot of trouble".
On Sunday, Trump also re-posted on social media a message suggesting that Rubio -- a Cuban-American former Florida senator and the son of Cuban exiles -- could become president of Cuba.
Trump shared that post with the comment: "Sounds good to me!"