(CNN) - The Arizona state legislature approved a bill Thursday night that would make presidential candidates have to prove they are U.S. citizens before their names could appear on a state ballot.
The so-called "birther bill" got final approval by a vote of 40 to 16 in the state House, according to the website for the Arizona State Legislature.
The bill's author, Arizona State Rep. Carl Seel, has said the bill was not targeted at President Barack Obama.
"This bill is not about Obama. It's not about that," he said. "It's about future elections and maintaining the integrity of the Constitution."
Questions have been raised about the citizenship of the president.
The bill still needs to be signed by Arizona Gov. Jan Brewer