Andrew Jackson
According To...

"I feel much alarmed at the prospect of seeing General Jackson President. He is one of the most unfit men I know of for such a place. He has had very little respect for laws or constitutions, and is, in fact, an able military chief. His passions are terrible. When I was President of the Senate he was a Senator; and he could never speak on account of the rashness of his feelings. I have seen him attempt it repeatedly, and as often choke with rage. His passions are no doubt cooler now; he has been much tried since I knew him, but he is a dangerous man."

- Thomas Jefferson About Andrew Jackson