The US Democrats have again published material from Rudy Giuiliani’s business friend Lev Parnas. It is to prove that Donald Trump knew the man.

The businessman Lev Parnas becomes an important figure in the Ukraine affair, which is the basis for the impeachment proceedings against US President Donald Trump. The president said he didn’t know the businessman who was born in the former Soviet Union. New material from the US Democrats raises considerable doubts about this.

A letter from committee chairman Adam Schiff last night said the Democrats had released additional documents that businessman Lev Parnas had given to the Intelligence Committee. Schiff is the House’s leading prosecutor in the impeachment case against Trump, which formally began on Thursday in the Senate.

The Democrats had already released incriminating Parnas material earlier this week. Parnas is a business partner of Trump’s lawyer Rudy Giuliani. Parnas is said to have played a central role in Giuliani’s efforts to find incriminating material about Trump’s rival Joe Biden in Ukraine. “President Trump knew precisely what was happening,” Parnas said on Wednesday. “I wouldn’t have done anything without the approval of Rudy Giuliani or the President.” Trump then said he didn’t know Parnas.