Sen. Mike Crapo (search) will undergo treatment for prostate cancer (search) after being diagnosed with the disease a second time, his office announced Tuesday. The Idaho Republican said side effects from the treatment should not limit his ability to conduct Senate business.

"I expect to be putting in full workdays and will, as usual, be meeting with constituents who have traveled to Washington," the 53-year-old Crapo said. He is to undergo a short radiation (search) session each weekday for eight weeks.

Crapo spokesman Lindsay Nothern said doctors believe the cancer may have arisen from tissue that was not completely removed when Crapo was first treated for the disease five years ago and had surgery to remove his prostate.

Crapo, an attorney from Idaho Falls, served as president of the state Senate before being elected to Congress in 1992. He was elected to the U.S. Senate in 1999.