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aren't there some kind of checks and balances in place to stop him running riot
Yes, Congress and the Courts. The former has Republican majorities in both houses, the latter is fairly balanced between Democrat and Republican nominees, but I think at least two places are due to come up for Presidential nominees in his term.
Meanwhile his people are deleting tweets from National Parks. It's going to be a long four years...
so trump can just introduce any policy he feels like
aren't there some kind of checks and balances in place to stop him running riot
in the uk can theresa may introduce policy without the authority of parliament ?