At an international summit in South Korea, President Obama is calling for deeper cuts in nuclear weapons. After a meeting with Russia President Dmitri Mdvedev, Obama said the U.S. and Russia agreed North Korea must not provoke animosity through its nuclear program. In other headlines, the Supreme Court begins three days of oral arguments to decide if the Affordable Care Act legislation violates the Constitution; according to Afghan police, the 17th victim in this month’s deadly shooting spree in Afghanistan was an unborn child; two British soldiers were killed this morning when a man wearing an Afghan Army uniform opened fire inside a NATO base in the southern Afghanistan; and the weekend decided the Final Four teams in the men’s NCAA Division I basketball tournament.