Democrats have accused the President of abusing his power by withholding nearly $400 million in US military aid to Ukraine and the prospect of a visit to the Oval Office by new President Volodymyr Zelensky in order to coerce the former Soviet state into investigating potential 2020 foe Joe Biden. Such conduct, they say, is worthy of impeachment because it amounts to bribery, puts Trump's own political goals ahead of America's national interests and effectively invited a foreign power to interfere in a US election.