Trump’s usual racism is mixed with panic here…if the House starts holding people in jail if they refuse to honor a subpoena, then at least some people will testify instead. Combined with people who are refusing to participate in the blockade (Yovanovich the most visible so far) and people honoring the subpoena (Sondland), it really is a huge danger for Trump if everyone testifies and the Democrats get all the documents they have requested. The outlines of his crimes are already clear, filling in the paragraphs is going to be devastating, and hopefully drag the Republicans down with him.
The scary thing is that he knows this, he has to, and the people around him do…allowing Turkey to invade Syria went against all of our policies, and he made that decision alone. It’s possible he sees the end game coming and is going to do as much damage as he can before he leaves…who that damage benefits is going to be illuminating. So far it’s Russia, Syria, Turkey, and ISIS. Watch where he visits internationally…just imagine how damaging to the US it would be if Trump asked for asylum in, say, Russia…