WASHINGTON (CNN) -- The CEO of a company whose employee is accused ofimproperly looking at the passp

WASHINGTON (CNN) -- The CEO of a company whose employee is accused of

improperly looking at the passport files of presidential candidates is

a consultant to the Barack Obama campaign, a source said Saturday.

Analysis Corp. President John Brennan, shown here in 2004, advises

Barack Obama, a source tells CNN.

1 of 2 John O. Brennan, president and CEO of the Analysis Corp.,

advises the Illinois Democrat on foreign policy and intelligence

issues, the source said.

Brennan briefed the media on behalf of the campaign this month.

The executive is a former senior CIA official and former interim

director of the National Counterterrorism Center.

He contributed $2,300 to the Obama campaign in January.

When asked about the contribution, a State Department official told

CNN's Zain Verjee, "We ethically awarded contracts. Political

affiliation is not one of the factors that we check."

On Friday, the department revealed that Obama's passport file was

improperly accessed three times this year, and the security of

passport files of the two other major presidential candidates --

Democrat Hillary Clinton and Republican John McCain -- had also been

breached. Watch the secretary of state apologize for the breach