In around March, 1968 my uncle was classified 4-F due to his asthma being so bad. In October 1968, he was called back in for another medical evaluation. He was informed that his asthma was not so bad after all, reclassified 1-A and ordered to await further orders. He is still waiting. Trump's story about the draft is not surprising and not a big deal. You should read the cite by akjeff64 if you want to read a real convoluted and desperate, if not illegal, avoidance of the draft.