The governor of Arizona has vetoed a bill requiring presidential candidates to prove US citizenship in order to get on the state's election ballot.
Republican Jan Brewer said the bill would have allowed officials to judge who is eligible to run for office.
A lingering "birther" conspiracy theory asserts US President Barack Obama was not born in the US and is thus ineligible to hold the office. But the bill's Republican backers insisted it was not aimed at Mr Obama.
