The Democratic Party on Monday filed a lawsuit against the Federal Elections Commission seeking to force the group to investigate whether Sen. John McCain has violated federal spending limits for his primary campaign.

The lawsuit, which was filed in the United States District Court in Washington, is the latest move by the Democratic National Committee that seeks to prove the Arizona senator locked himself into campaign spending limits earlier this year.

The DNC claims McCain did so when he used the prospect of $6 million in federal matching funds as collateral for a December bank loan to his campaign.

But after it became apparent he would be the Republican presidential nominee, McCain notified the FEC in early February that he was not claiming federal matching funds. Claiming those funds would limit his spending on the primary campaign to $54 million.

The DNC then filed a complaint with the FEC in February, arguing that McCain should be forced to accept the matching funds — and the spending limits that come with it.

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