White House officials have approached American Express Co. Chief Executive Officer Kenneth Chenault about joining President Barack Obama's second-term administration, possibly as Treasury secretary, according to two people familiar with the matter.

White House Chief of Staff Jack Lew remains the leading contender for the Treasury job, the people said. Still, consideration of Chenault among Obama's staff may indicate the president hasn't made a final decision on a replacement for Treasury Secretary Timothy F. Geithner, who has said he plans to leave the post.

Other potential roles for Chenault, a longtime Obama supporter, may be as Commerce secretary or as a senior adviser to the president, according to the people, who asked for anonymity to discuss internal administration deliberations. White House officials have also considered Xerox Corp. CEO Ursula Burns as a potential nominee for the Commerce Department job, both of the people said.