Would trump actually leave the UN if he got in power, could he even do that and would it be a good idea?

I thought I would ask a trump question as everyone does it, this is possibly the only thing he's said that I consider really dumb, I don't know if Americans realise how much they need it too because they get a good return on the money they invested into it I think..
Would trump actually leave the UN if he got in power, could he even do that and would it be a good idea?
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