Watch Bono's Speech on How Development Can Prevent Extremism

Bono argued that investments in development and education in third-world countries, and not border walls and executive orders, could prevent extremism during the U2 singer's speech at the Munich Security Conference Friday."I don't see a body of water wide enough, or a wall high enough, to keep these problems from our doors," Bono warned. "The frontier of national interest is no longer the national border. You may not be interested in the trouble on a far-off street or across the Mediterranean on