Trump, Bill Clinton trade insults in unusual exchange

President-elect Donald Trump speaks during a USA Thank You Tour event in Mobile, Alabama. REUTERS/Lucas Jackson

WASHINGTON (Reuters) - Donald Trump pounced on a reported comment from Bill Clinton, the former president and husband of his Democratic rival in the Nov. 8 election, in an usual exchange on Tuesday between future and former U.S. presidents.

Clinton, whose wife, Hillary, lost last month's election after spending millions of dollars more than her Republican rival, was spotted at a bookstore near the couple's hometown a suburb of New York City earlier this month. One person asked him, "Is Trump smart?" according to the editor of a local newspaper.