CNN

Obama aide David Axelrod, pictured here at a Pennsylvania campaign office earlier this week, called the release of information about Sen. Obama's aunt 'suspicious.'

(CNN)– Barack Obama’s chief strategist said Saturday that he thought the last-minute appearance of stories like this weekend’s news that the Illinois senator’s aunt may be living in the country illegally would make people “suspicious.”

The Associated Press has reported that Zeituni Onyango, a native of Kenya, has been living in Boston despite losing an appeal for asylum four years ago. Obama’s campaign issued a statement earlier Saturday that the Democratic nominee “has no knowledge of her status but obviously believes that any and all appropriate laws should be followed." The campaign also said it would return $265 in donations from Onyango, who is not legally permitted to donate to Obama because she is not a U.S. citizen.

CNN has been unable to independently verify the aunt's immigration status.

On the campaign trail in Nevada, Axelrod said the timing of the report might raise a few eyebrows. "The campaign issued a statement on that," he said. "And I don't have anything more to add to it, other than I think people are suspicious about stories that surface in the last 72 hours of a national campaign... I think that they're going to take that, they're going to put it in that context."

House Judiciary Committee Chairman John Conyers of Michigan questioned both the timing and the source of the news Saturday, sending a public letter to Homeland Security chief Michael Chertoff requesting an investigation.