The Obama campaign recently announced that it has three million individual donors.

(CNN) – The Republican National Committee announced Wednesday that it plans to submit an addendum to its recent complaint filed with the Federal Election Commission about the fundraising of Sen. Barack Obama’s presidential campaign.

“This is an organization that has raised over $450 million in campaign contributions,” RNC chief counsel Sean Cairncross told reporters Wednesday. “This is money that is used to elect a potential president of the United States and there are some substantial questions where some of it came from and whether some of it was raised in compliance with the law,” Cairncross added.

The addendum will be based on additional press reports of questionable donations to Obama that have come to light since the complaint was filed on October 6, according to Cairncross.

Listen: Cairncross explains updates to RNC's FEC complaint

In its complaint, the RNC has asked the FEC to investigate whether the Obama campaign accepted prohibited contributions from foreign nationals and accepted multiple contributions from individual donors that exceed contribution limits when aggregated together. The RNC is also asking that the FEC audit the entirety of the contributions received by the Obama campaign – even contributions of less than $200 which the campaign is not otherwise legally required to itemize or disclose in its FEC reports.

The McCain campaign and the RNC have also recently sought to put public pressure on the Obama campaign to identify its small donors even without a legal requirement to do so. The McCain campaign has made that information publicly available on its Web site and the RNC recently launched a Web site where information about its small dollar donors can be accessed.

The Obama campaign announced last weekend that it raised an unprecedented $150 million during the month of September bringing Obama’s total fundraising for his presidential bid to approximately $600 million as of the end of September.