U.S. presidential candidate Rick Perry has raised fresh doubt over whether President Barack Obama was born in the U.S. The Texas governor says he has not joined the so-called 'birther' movement, which began mostly on the internet and found a voice in the real estate mogul Donald Trump. But after meeting last month with the former presidential hopeful, Perry says he cannot give a 'definitive answer' as to if the document subsequently released by the president is authentic.