APPLETON, Wis. (AP) -- The field of Republican challengers to take on northeast Wisconsin Congressman Steve Kagen next year continues to grow.

A 53-year-old Kaukauna roofing contractor with no experience in politics is the third Republican to announce his candidacy for the 8th Congressional District.

Reid Ribble says he filed nomination papers this week because he thinks the ballooning federal debt in the trillions of dollars is crippling the economy.

Other Republicans who announced earlier are Door County Supervisor Marc Savard and Brown County Supervisor Andy Williams.

Kagen, a Democrat who was a doctor in Appleton before getting into politics, has narrowly won two terms -- both against former state Assembly Speaker John Gard.