Trump Refuses to Cooperate with Impeachment Inquiry, Raises Stakes with Democrats

US President Donald Trump confirmed on Tuesday that he does not plan to cooperate in investigations into his possible impeachment, in a process opened by Congress. White House lawyer Pat Cipollone sent a letter to the Speaker of the House of Representatives, Nancy Pelosi (D-CA), on behalf of President Trump, explaining the stance the president will take in the process of ascertaining whether there was pressure on Ukraine to investigate the former Vice President, Joe Biden.