Yes he did. And keep in mind he was only available because months out from the election he was so far behind in his re-election for governor he literally couldn’t win. Sharp politician that everyone pretends he is.
They can be ignored until a federal judge issues an order to comply. If the person subpoenaed doesn’t comply the DOJ has no say in the matter and the judge can order the arrest and detention of the witness.
Well, it is good to see that at least some Trump supporters are starting to recognize that the republicans are no better than the democrats now - even if they are putting a spin on it to make the ■■■■ sandwich that is the current iteration of the republican party look a bit cleaner.