The newly elected Republican, who has resisted calls to resign, has pleaded not guilty other charges, first filed in May, accusing him of lying to Congress about his wealth.
He was arraigned on Friday on a revised indictment accusing him of several frauds, including making tens of thousands of dollars in authorised charges on credit cards belonging to campaign donors.
Mr Santos has been on bail while he awaits trial.
He has denied any serious wrongdoing.
Thank you for registering
Please refresh the page or navigate to another page on the site to be automatically logged inPlease refresh your browser to be logged in