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By Steve Holland WASHINGTON (Reuters) - U.S. Republican presidential candidate Jeb Bush offered his most direct assault on Donald Trump to date on Tuesday, retaliating for a series of personal insults with a review of his front-running rival's past record of supporting Democratic causes. In a video, the Bush campaign used Trump's own words in support of Democrat Hillary Clinton and for a universal healthcare system, higher taxes and partial-birth abortion to make the case that he is not a conservative. Asked by a TV interviewer whether he was a Republican or a Democrat, Trump is seen on the video saying: "You'd be shocked if I said that in many cases I probably identify more as a Democrat." Bush, 62, is among the Republican presidential candidates whose standing has been damaged by Trump's summer rise.