Harvard University Law professor emeritus Alan Dershowitz says the Constitution leaves unresolved questions about whether President Donald Trump could serve a third term, framing the issue as a legal thought experiment rather than a political road map.

Dershowitz said he handed Trump a draft copy of his forthcoming book, Could President Trump Constitutionally Serve a Third Term?, during a brief interaction at the White House during a Hanukkah event Tuesday evening. The book, expected to be published next year, examines whether the 22nd Amendment’s language forecloses all avenues for a former two-term president to return to office.