"WASHINGTON (CNN) -- Breaking ranks with his party and reversing his earlier stance, a senior retiring Republican lawmaker said Wednesday the military strike against Iraq was "a mistake," and he blasted a "massive failure" of intelligence before the war. The unexpected four-page statement came from Rep. Doug Bereuter of Nebraska, who until earlier this month was the vice chairman of the House Intelligence Committee -- a panel that reviewed much of the evidence the administration cited before going to war. "I've reached the conclusion, retrospectively, now that the inadequate intelligence and faulty conclusions are being revealed, that all things being considered, it was a mistake to launch that military action, especially without a broad and engaged international coalition," Bereuter wrote in a four-page letter to his constituents. "The cost in casualties is already large and growing, and the immediate and long-term financial costs are incredible."