Finding a jury for Donald Trump's hush money trial is proving tricky.

The former US President has pleaded not guilty to 34 felony counts of falsifying business records.

Already on day one, 50 prospective jurors have been dismissed after saying they couldn't be impartial.

Cornell University law professor Randy Zelin says potential jurors are asked personal questions to determine their suitability.

"You're trying to get little pieces of insight into whether this person is going to be a free thinker, good for the defence - or a by-the-book person."

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