[cnn-photo-caption image= http://i.cdn.turner.com/cnn/2008/images/03/21/art.obamapass.ap.jpg caption=" Obama is calling for a congressional investigation."] (CNN) - Sen. Barack Obama Friday called for an investigation into how the security of the passport files of the three remaining presidential candidates was breached.
The State Department admitted Friday that the passport files of Obama, Sen. Hillary Clinton and Sen. John McCain had been accessed without authorization.
"One of the things that the American people count on in their interactions with any level of government is that if they have to disclose personal information that it stay personal and stay private," Obama said in Portland, Oregon.
"And when you have not just one but a series of attempts to tap into people's personal records, that's a problem not just for me, but for how our government is functioning," he said.
Obama said he expected "a full and thorough investigation" by the administration done in conjunction with congressional oversight committees.
The State Department's inspector general has already started an investigation, department officials said.
Attorney General Michael Mukasey said the Justice Department had not launched an investigation and did not expect to unless it was asked by the inspector general.