Nation and world news briefs

10.2 million viewers watched fourth Democratic primary debate on NBC NEW YORK — The fourth Democratic primary debate broadcast Sunday on NBC was watched by 10.2 million viewers, according to Nielsen data. The figure ranks second among the four Democratic debates held so far and is up substantially from the 8.03 million who watched ABC’s telecast of the Dec. 19 meeting of the three contenders for the 2016 Democratic nomination, Hillary Clinton, Sen. Bernie Sanders and former Maryland Gov. Martin O’Malley. The debate, moderated by “NBC Nightly News” anchor Lester Holt and NBC News chief foreign affairs correspondent Andrea Mitchell, was also seen by an additional 1.2 million viewers across...