Iowa’s U-S Senators are on opposite sides of the fight over a national storage site for nuclear waste. The proposal: put all the nation’s spent nuclear fuel in Nevada’s Yucca Mountain. Senator Charles Grassley, a republican, supports the idea. Senator Tom Harkin, a democrat, opposes it. Harkin says he’s saying “no” to making Iowa a “nuclear waste superhighway” as the nuclear waste is to be shipped to Nevada via truck and train, and he’s concerned about the threat of terrorist attacks. Grassley says it makes sense to store all the nuclear waste in one facility, and there’s a bigger threat of terrorist attacks to the 141 sites where spent nuclear fuel’s now stored across the country.