Lead House Impeachment manager Adam Schiff pressed for calling more witnesses in the US President Donald Trump's impeachment trial ahead of vote in Senate in Washington DC on Friday. Schiff drew on a US media report suggesting Trump asked former National Security Adviser John Bolton to intervene in Ukraine earlier than it was known. "The President said today 'I never instructed John Bolton to set... Еще up a meeting for Rudy Giuliani, one of Americas, one of the greatest corruption fighters in America.' So here you have the president saying John Bolton is not telling the truth. Let's find out. Let's put John Bolton under oath. Let's find out who is telling the truth," said Schiff. Senators were preparing to vote on whether to call more witnesses in the impeachment trial. Trump is facing charges of abuse of power as well as obstruction of Congress, but with a Republican majority in the Senate he looks set to remain in office.