A national watchdog group has filed a Federal Election Commission complaint against Gov. Scott Walker and three other likely presidential candidates for what it calls a "total disregard" for campaign finance law.

Walker has hired staff and traveled extensively to early presidential primary states through his political group "Our American Revival." Walker's group is filed as a 527 organization, which lets it accept unlimited donations.

But Attorney Paul S. Ryan with the Campaign Legal Center said Tuesday that Walker's actions show he's a candidate for president and should be limited to donations of no more than $2,700 per person.

"At the end of the day, if you are raising money outside of the $2,700 per-candidate limit and you are using that money to pay for 'testing the waters' activity, you're breaking the law," said Ryan.

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The Campaign Legal Center also filed complaints against Republicans Jeb Bush and Rick Santorum and Democrat Martin O'Malley.

Our American Revival spokeswoman Kristen Kukowski wrote in an emailed response that "if there are any announcements about Walker's future, the governor will do it in accordance with the law.

Editor's Note: This story has been updated with a response from Our American Revival.