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President Trump is accused of breaking the law by pressuring Ukraine's leader to dig up damaging information on a political rival.

In July, he urged his Ukrainian counterpart to investigate one of the frontrunners to take him on in next year's presidential election. This matters because it is illegal to ask foreign entities for help in winning a US election.

An impeachment inquiry that could see the president eventually removed from office is under way.

But there is a fierce debate about whether Mr Trump broke the law or committed an impeachable offence - he says he has done nothing wrong.

David Grossman reports.