Washington: William B Taylor Jr., the top US diplomat in Ukraine and one of the most important witnesses for the Democrats' impeachment procedure against Donald Trump, on Wednesday claimed that the President cared more about an investigation of former vice-president Joe Biden than he did about Ukraine.

The testimony from Taylor before the Committee provided new details about the President's personal involvement in the push for Ukraine to open investigations into his political rivals as Democrats began public impeachment hearings that could lead to the House voting to impeach a president for just the third time in US history, CNN reported.