Indicted state Rep. Derrick Smith has used campaign funds to pay more than $37,000 to his defense team.
Smith disclosed the payment in a filing last month, several months after the actual payment.
Smith was accused of taking a bribe to write what he thought was a letter of support for a day care center's state grant application.
His Illinois House colleagues in August voted 100-6 to expel him. It was the first time the House had expelled a member in more than 100 years.
Smith has pleaded not guilty to federal bribery charges. His trial is set for October.