The White House signals it will not cooperate with the impeachment inquiry:
https://www.nytimes.com/2019/10/08/us/politics/sondland-trump-ukraine-impeach.html
WASHINGTON — The White House all but declared war on the House impeachment inquiry on Tuesday, intervening for the first time to block the testimony of a key witness as President Trump signaled his administration would try to starve investigators of more witnesses and documents.
The decision to block Gordon D. Sondland, the United States ambassador to the European Union, from speaking with investigators for three House committees came just hours before he was to appear on Capitol Hill, provoking an immediate conflict with potentially profound consequences for the inquiry and for the president himself.
Mr. Trump, defiant as investigators dig further into his efforts to pressure Ukraine to find dirt on his political rivals, declared the inquiry illegitimate in a signal that he plans to stonewall Congress, an act that could itself build the case for charging him in an impeachment proceeding with obstruction.