So far he has denied it by just not doing it. That's all he owes the process. It is the governments job to go forward with whatever they want to do. Also, Trump's team has made counter-offers for written responses, limiting scope etc. So it is the government's job to say no to whatever it cannot accept then counter-offer again or just do whatever legal process allows them to do for the next step. If the government feels it has the power to compel him to do anything, then they need to serve notice to the defendant/target.
You said you want the subpoena.The quickest way to get there is for Trump to just say no to an interview.You must want this to keep dragging on.Personally Im ok with that to.
