>> tucker: president trump clearly thinks this investigation is a lot of nonsense. on that one point, professor alan dershowitz of harvard law school seems to agree with him. he joins us tonight. >> i don't agree with president trump on a great many of his agenda issues. i am a liberal democrat who voted enthusiastically for hillary clinton. but i think i'm a person of a principle and i realize that what the democrats are trying to do to president trump is exactly what republicans tried to do to hillary clinton. lock her up, throw away the key. the very people who were pushing for donald trump to be investigated, indicted, and impeached would be on the other side of the issue if the shoe were on the other foot. if they had tried to expand the obstruction of justice statute or espionage statue and apply it to a democrat rather than a