The John McCainJohn McCainCoats: Trump seemed obsessed with Russia probe The Hill's Whip List: Senate ObamaCare repeal bill Meghan McCain slams 'felon' Dinesh D'Souza over tweets mocking father's captivity MORE campaign owes American Express $1.37 million in credit card debt and fees, according to Federal Election Commission filings.

A memo from the Democratic National Committee mocked the number, claiming "the campaign is taking its cues from the McCain's personal finances."

In June the McCain's reported more than $100,000 in personal credit card debt. Reports on Cindy McCain's personal finances have shown the beer heiress has charged as much as $500,000 in one month on an American Express card.