Senators offer bill to block any U.S. president from leaving NATO

(Corrects spelling of 'Republican' in paragraph 1) By Patricia Zengerle WASHINGTON (Reuters) -Democratic and Republican senators renewed an effort to block any U.S. president from leaving NATO on Wednesday, as leaders of the alliance attended an eventful summit in Vilnius, Lithuania. The joint resolution, seen by Reuters, is a fresh effort by Congress to prevent the president from withdrawing from the alliance without the Senate's approval. "The President shall not suspend, terminate, denounce, or withdraw the United States from the North Atlantic Treaty, done at Washington, DC, April 4, 1949,...