sue and edgar wachenheim, iii. corporate funding is provided by mutual of america-- designing customized individual and group retirement products. that's why we are yourar retirement company. additional support has been provided by: and by the corporation for public broadcasting, and by contributions to your pbs station from viewers like you. thank you. from the tisch wnet studios at lincoln center in new york, hari sreenivasan. >> sreenivasan: again and thanks for joining us. president obama tried to reassure americans that the u.s. government is doing everything it can s asu to protect us from potential terrorist attacks like the one last week in san bernardino, california. the president spoke to the american public from the oval office tonight for only they third time in his presidency. he said there is no evidence that california couple who gunned down w 14 people and wounded more in was directed by indemnity overseas organization or part of any broader conspiracy here in the u.s. but he also said the military

sue and edgar wachenheim, iii. corporate funding is provided by mutual of america-- designing customized individual and group retirement products. that's why we are your retirement company. additional support has been provided by: and by the corporation for public broadcasting, and by conributions to your pbs station from viewers like you. thank you. from the tisch wnet studios at lincoln center in new york, megan thompson. >> thompson: good evening. thanks for joining us. i'm megan thompson, in for hari sreenivasan. officials now say at least 17 people are dead after a string of deadly storms and tornadoes ripped through the south earlier this week. last night, families near birmingham, alabama were left to sort through what was left of their homes after a tornado touched down christmas day. two hundred roads in alabama are still closed and flood warnings are still in effect. in tennessee and mississippi, recovery crews and utility workers continued to clean up after a tornado tore a 100-mile path through those st

sue and edgar wachenheim, iii. corporate funding is provided by mutual of america-- designing customized individual and group retirement products. that's why we are your retirement company. additional support has been provided by: and by the corporation for public broadcasting, and by contributions to your pbs station from viewers like you. thank you. from the tisch wnet studios at lincoln center in new york, hari sreenivasan. >> sreenivasan: good evening and thanks for joining us. negotiators from nearly every country in the world unanimously agreed to a landmark agreement today to combat climate change, pledging to reduce their emissions from burning fossil fuels that cause global warming. it's the first-ever climate pact to commit all countries -- industrialized ones like the united states and developing countries like china and india - - to take action. delegates from 196 countries cheered as the gavel came down to end the two week conference. no delegation objected to the 31-page final agreement, which is set

sue and edgar wachenheim, iii. corporate funding is provided by mutual of america-- designing customized individual and group retirement products. that's why we are your retirement company. additional support has been provided by: the tisch wnet stt lincoln center in new york, this is pbs newshour weekend. >> thompson: good evening. thanks for joining us. i'm megan thompson, in for hari sreenivasan. the iraqi army claimed a major victory today over islamic state militants. the army said it has defeated isis fighters in the city of ramadi, about 80 miles west of baghdad, after a week of heavy fighting. an iraqi military spokesman said the u.s.-trained troops have retaken a complex isis was using as a headquarters and are now focusing on clearing out pockets of resistance. the iraqi government plans to hold a flag raising ceremony over the complex on monday. ramadi was captured by isis in may, in what was seen as an embarrassing defeat for the iraqi army. at the time, u.s. defense secretary ash carter said iraqi forc

sue and edgar wachenheim, iii. corporate funding is provided by mutual of america-- designing customized individual and group retirement products. that's why we are your retirement company. additional support has been provided by: and by the corporation for public broadcasting, and by contributions to your pbs station from viewers like you. thank you. from the tisch wnet studios at lincoln center in new york, hari sreenivasan. >> sreenivasan: good evening and thanks for joining us. president obama has vetoed legislation intended to slow his policies on climate change. the bill would have nullified an environmental protection agency rule requiring power plants to reduce carbon emissions by one- third over the next 15 years. his "pocket veto"-- exercised after congress had adjourned for the year-- was expected. 27 states are suing to stop the rule. the president is in hawaii for his annual two-week family vacation in his home state. en route, the president and first lady stopped in san bernardino, california, to meet

sue and edgar wachenheim, iii. corporate funding is provided by mutual of america-- designing customized individual and group retirement products. that's why we are your retirement company. additional support has been provided by: and by the corporation for public broadcasting, and by contributions to your pbs station from viewers like you. thank you. from the tisch wnet studios at lincoln center in new york, hari sreenivasan. >> sreenivasan: good evening. thanks for joining us. united nations secretary general ban ki moon says the climate change pact endorsed by close to 200 nations is a turning point" to make human life "sustainable on a healthy planet. world leaders are welcoming the agreement designed to curb planet-polluting carbon gases that have been causing a rise in global temperatures. the paris agreement approved yesterday commits countries to take steps that could cap the rise in temperatures to no more than two degrees celsius-- or just over 3.5 degrees fahrenheit-- over pre-industrial age levels. the

sue and edgar wachenheim, iii. corporate funding is provided by mutual of america-- designing customized individual and group retirement products. at's why we are your tirement company. additional support has been provided by: and by the corporation for public broadcasting, and by contributions to your pbs station from viewers like you. thank you. from the tisch wnet studios at lincoln center in new york, hari sreenivasan. >> sreenivasan: good evening and thanks for joining us. a key region in afghanistan could be on the verge of falling to the taliban. the deputy governor of helmand province, an area that u.s. troops once fought to secure, says urgent action is needed to prevent its collapse. the official posted an unusual public plea to afghan president ashraf ghani on facebook saying, quote: "helmand is standing on the brink, and there is a serious need for you to come." the helmand official said he had lost 90 soldiers in the past two days and hundreds more during six months of taliban attacks. a spokesman for

sue and edgar wachenheim, iii. corporate funding is provided by mutual of america-- designing customized individual and group retirent