NEW YORK –  A U.S. senator has proposed a law that could bring five years of prison time to anyone who scales high-profile national structures such as the World Trade Center, Statue of Liberty and Golden Gate Bridge.

Sen. Charles Schumer of New York said Monday he's pushing the tough sentence because of terror threats he says are now "at a high" — with New York as the top target.

The law also would apply to a nuclear power plant in suburban New York.

A Russian tourist was arrested in August after climbing the Brooklyn Bridge. Weeks earlier, two German artists claimed responsibility for replacing American flags atop the bridge with white ones as a public art stunt. And last spring, a teen climbed the World Trade Center tower.