Not sure, only ever tried one for a few feet. Probably could if I wanted to, but it'd probably be awkward since they're so tiny and I'm 6'2" ~220lbs. I think they'd be a little shaky/wobbly/unstable at the front wheel since they turn on a dime - that's the part that would take some getting used to scooting in a pretty straight line.
It's not a goal of mine, though, so I may never find out Unless one just happens to be kicking around and I hop on it sometime.
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No
for supporting trump. Because doing so is deplorable.