Tonight on The Last Word: At a factory in Ohio Trump launched into an attack on John McCain. Earlier Trump falsely claimed that because he was elected to the presidency, Mueller shouldn't be allowed to investigate him. Julian Castro joins The Last Word to discuss Ben Carson's HUD and his run for president. We examine the Trump administration’s trouble with the courts. And take a look at presidential candidate Mayor Pete Buttiegieg. John Harwood, David Leonhardt, Neal Katyal, Julian Castro and Bill Buzbee all join Ali Velshi.

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