Ted Olsen, the former U.S. solicitor general, writes at the NeverTrump Weekly Standard that a “constitutional crisis” may be in the offing—but that Special Counsel Robert Mueller’s odds of compelling President Trump to appear before a grand jury are pretty long:
The importance of all this to the president is that it is unlikely that he can be forced to give grand jury testimony simply to satisfy Mueller’s curiosity and submit to a potential perjury trap. He could, in short, put Mueller to his proof—make Mueller show that the president’s testimony was necessary to prosecute someone else. And that such evidence could not be obtained elsewhere. That is a high bar, indeed, and one that at this point Mueller has not shown he would be able to surmount.