Trump allowed everyone that Mueller wanted to talk with to testify during the investigation and released immediately every piece of information that Mueller asked for. Trump answered Mueller's questions in written form. He completely cooperated. Democrats ignored the results of the investigations and continued with their persecution of the president. Trump is completely within his rights not to cooperate any more.
Executive privilege, as exercised by every other president before him, is perfectly acceptable. Democrats, however, couldn't even wait for the court challenges to be ruled on. The second article should be thrown out on it's face, since no ruling was made on Trump's use of executive privilege.
Democrats, in a more sane time in our nation, would be shunned for being the corrupt children that they are. Trump was right in that the democrats control the news and that is a danger to the American people.