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Sen. Mark Kirk on Wednesday became the first prominent Republican to effectively unendorse Donald Trump for president. “I cannot and will not support my party's nominee for president,” the Illinois-based lawmaker told the AP. Last month, when asked if he’d support Trump in the general election, Kirk said, “Certainly, if he's the nominee.” The senator also tweeted: “Given my military experience, Donald Trump does not have the temperament to command our military or our nuclear arsenal.” The GOP senator is currently in the midst of a tough re-election race, in which he trails his challenger, Democratic Rep. Tammy Duckworth.