WASHINGTON -- Democratic presidential candidate Barack Obama said Saturday he didn't know that one of his relatives was living in Boston illegally and believes the appropriate laws should be followed.

The Associated Press found that Obama's aunt had been instructed to leave the country four years ago by an immigration judge who rejected her request for asylum from her native Kenya. The woman, Zeituni Onyango, is living in public housing in Boston and is the half-sister of Obama's late father.

A statement given to the AP by Obama's campaign said, "Senator Obama has no knowledge of her status but obviously believes that any and all appropriate laws be followed." Zeituni Onyango, 56, referred to as "Aunti Zeituni" in Obama's memoir, was instructed to leave the United States by a U.S. immigration judge who denied her asylum request, a person familiar with the matter told the AP late Friday. This person spoke on condition of anonymity because no one was authorized to discuss Onyango's case.

A spokeswoman for the Boston Housing Authority said when Onyango was given public housing she met all federal and state standards. The deportation order came a year later, according to Lydia Agro. She said the BHA was never notified of the order.

Information about the deportation case was disclosed and confirmed by two separate sources, one of them a federal law enforcement official. The information they made available is known to officials in the federal government, but the AP could not establish whether anyone at a political level in the Bush administration or in the McCain campaign had been involved in its release.

Onyango's refusal to leave the country would represent an administrative, non-criminal violation of U.S. immigration law, meaning such cases are handled outside the criminal court system. Estimates vary, but many experts believe there are more than 10 million such immigrants in the United States.

The AP could not reach Onyango immediately for comment. No one answered the telephone number listed in her name late Friday. It was unclear why her request for asylum was rejected in 2004.

Onyango is not a relative whom Obama has discussed in campaign appearances and, unlike Obama's father and grandmother, is not someone who has been part of the public discussion about his personal life.

A spokeswoman for U.S. Immigrations and Customs Enforcement, Kelly Nantel, said the government does not comment on an individual's citizenship status or immigration case.

Onyango's case — coming to light just days before the presidential election — led to an unusual nationwide directive within Immigrations and Customs Enforcement requiring any deportations prior to Tuesday's election to be approved at least at the level of ICE regional directors, the U.S. law enforcement official told the AP.

The unusual directive suggests that the Bush administration is sensitive to the political implications of Onyango's case coming to light so close to the election.

One of the sources acknowledged he was not a supporter of Obama or John McCain and said he has no plans to vote on Tuesday. He said that was not a motive for releasing the information.

Kenya is in eastern Africa between Somalia and Tanzania. The country has been fractured in violence in recent years, including a period of two months of bloodshed after December 2007 that killed 1,500 people.

The disclosure about Onyango came just one day after Obama's presidential campaign confirmed to the Times of London that Onyango, who has lived quietly in public housing in South Boston for five years, was Obama's half aunt on his father's side.