Lets not forget that the reason we are debating about whether it's criminal or not is because TECSHARE thinks that House subpoenas are not valid since the house isn't the established process of impeachment.
the Democrats are attempting to conduct an extralegal investigation outside the process established for impeachment in order to maintain their one sided investigation and prevent any defense from being presented. Why the fuck would Trump participate in this farce of an "investigation" completely outside of the law?
From the article he posted to defend his stance:
How Congress Sets the Rules for Impeachment
Both the U.S. House of Representatives and the U.S. Senate have the right to make their own rules governing their procedure, and to change those rules. Under current rules, the actual impeachment inquiry begins in the Judiciary Committee of the House of Representatives.
https://litigation.findlaw.com/legal-system/presidential-impeachment-the-legal-standard-and-procedure.htmlI'm guessing they are implying that they don't mean they can change the rules that are actually in the constitution without an amendment. (Chief Justice must preside and stuff like that)