A formal complaint filed with the Federal Election Commission Thursday claims Sean "Diddy" Combs violated federal law during the U.S. presidential campaign.

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The National Legal and Policy Center, NPLC, claims Diddy violated the Federal Election Campaign Act and the Internal Revenue Service Code, when he rallied support of Democratic presidential candidate, Sen. John Kerry, AllHipHop.com reported.

The NLPC alleges a Detroit rally conducted by Diddy's non-profit group, Citizen Change, included speeches from actor Leonardo DiCaprio and Detroit Mayor Kwame Kilpatrick urging the crowd to oust President Bush from office.

The complaint asks the FEC to investigate whether Diddy used his company's corporate funds to illegally support Citizen Change.

The complaint also alleges Diddy may have used his "Vote or Die" campaign as a commercial endeavor to make money for his clothing line.

Combs was not available for comment.