"Trump will respond to a grand jury subpoena with a protracted legal challenge that will go to the Supreme Court. At the very least, he is likely to challenge the constitutionality of the special counsel’s appointment"https://www.politico.com/magazine/story/2018/02/12/donald-trump-mueller-subpoena-216967 …
If Mueller had any gotcha questions to ask Trump, we would have heard them already. By now we would have been given the details over and over again until we were utterly sick of hearing them.