Trump has asked his advisers about his power to pardon aides, family members and even himself in connection with the probe, according to one of those people. A second person said Trump’s lawyers have been discussing the president’s pardoning powers among themselves.

Trump’s legal team declined to comment on the issue. But one adviser said the president has simply expressed a curiosity in understanding the reach of his pardoning authority, as well as the limits of Mueller’s investigation.

“This is not in the context of, ‘I can’t wait to pardon myself,’ ” a close adviser said…

Trump has been fuming about the probe in recent weeks as he has been informed about the legal questions that he and his family could face. His primary frustration centers on why allegations that his campaign coordinated with Russia should spread into scrutinizing many years of Trump dealmaking. He has told aides he was especially disturbed after learning Mueller would be able to access several years of his tax returns.