President Trump is transforming the study of constitutional law.

The nation’s law professors have spent the summer revising their courses to take account of a president who generates fresh constitutional questions by the tweet. When classes start in the coming weeks, law students will be studying more than dusty doctrine. They will also be considering an array of pressing questions.

When is firing a subordinate to thwart an investigation obstruction of justice? Can a sitting president be indicted? Can the president pardon himself? May he accept financial benefits from foreign governments? Are his campaign statements evidence of religious bias? Must Congress authorize a nuclear strike against North Korea?

“It would be easy to design a whole course or write an entire book about the constitutional issues raised in just the first six months of the Trump presidency,” said Jay D. Wexler, a law professor at Boston University.

Constitutional scholars sounded both anxious and energized by these developments.

“Teaching the Constitution has never felt more urgent, like unraveling a mix of ‘Apocalypse Now’ and ‘Alice in Wonderland,’ but with the highest possible stakes,” said Laurence H. Tribe, a law professor at Harvard and vocal critic of Mr. Trump, who also represents plaintiffs challenging foreign payments to Mr. Trump’s companies. Many law professors, including several quoted in this column, have signed briefs opposing Mr. Trump’s actions.