WASHINGTON : A pocket version of the U.S. Constitution, which was flashed at the National Democratic Convention on Thursday by the Pakistani-American father of a U.S. soldier killed in Iraq, has become a best-seller on Amazon.com.

 The 52-page pamphlet printed by the National Center for Constitutional Studies sells for $1 and entered the Top 10 best-selling books on Amazon on Saturday afternoon and remained there Sunday morning. The site produces an hourly list of its best sellers.

 The Constitution emerged as a best-seller days after Khizr Khan, the father of Capt. Humayun Khan, took out a pocket Constitution and offered to lend it to Republican presidential candidate Donald Trump during a speech at the Democratic National Convention.