WASHINGTON -- US President Donald Trump discussed a draft copy of a book by lawyer Alan Dershowitz that examines whether Trump could constitutionally serve a third term as president, The Wall Street Journal reported on Wednesday. Trump's flirtation with the idea of a third term has alarmed opponents and constitutional experts, who say it would test the 22nd Amendment of the US Constitution, which Congress approved after Franklin Roosevelt was elected four times. The 22nd Amendment states in part that "No person shall be elected to the office of the President more than twice." But Dershowitz said he told Trump on Tuesday that the Constitution was not clear on the issue. He said that during an Oval Office meeting, he handed Trump a draft of the book, titled "Could President Trump Constitutionally Serve a Third Term?"