The controversial former doctor who examined Donald Trump after the recent assassination attempt is lashing out at the FBI director who raised questions about whether the ex-president was actually struck by a bullet — or shrapnel. Ronny Jackson, a Texas GOP lawmaker who once served as White House doctor under Trump and Barack Obama, recently released a letter in which he claims to explain away some of the questions about Trump’s health after purportedly being shot. It was met with mockery because Jackson had previously been accused of running a “pill mill” in the White House. “The bullet passe…