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KNOW IT ALL: Tuesday's Top 7 Stories at NBC News

A polls that shows fear of terror could shape the presidential race, and other stories we're following today.
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Good morning. Here are some of the stories we're following today:

1. Poll: Terror Fears Drag Down Obama's Support

President Barack Obama's job rating has dropped to 43 percent — its lowest level in more than a year — after the recent terror attacks in Paris and San Bernardino, according to a new NBC News/Wall Street Journal poll. Pollsters say the concern about national security could end up shaping the 2016 race for president in a way that wasn't entirely expected. Read more in POLITICS.

2. U.S. Considers Closer Scrutiny of Visa-Seekers' Social Media

The U.S. government may impose tighter scrutiny of visa-seekers' social media accounts following revelations that one of the San Bernardino attackers discussed violence on her Facebook account before she was allowed into the country. A stricter regulation could make such scrutiny a regular step in the visa approval process. Read more in NEWS.

3. Bill Cosby Sues Seven Sexual Assault Accusers

Bill Cosby on Monday sued seven of the more than 50 women who have accused him of sexual assault, claiming they defamed his character and were looking to cash in on his fame. Cosby denies ever drugging or sexually assaulting any of the seven women listed in the claim. Read more in NEWS.

4. Sgt. Bowe Bergdahl Facing Court Martial

Army Sgt. Bowe Bergdahl, who was captured by the Taliban after he left his post in Afghanistan back in June 2009 and was charged in March with desertion and misbehavior before the enemy, is facing a court martial, according to military brass and the defendant's lawyer. Bergdahl could face a life sentence. Read more in NEWS.

5. Trump Audience Member Yells Nazi Salute at Protester

Donald Trump was interrupted several times by Black Lives Matter protesters at a rally Monday night, and some of the presidential candidate's supporters lashed out physically and verbally. A large middle-aged man shouted, "Sieg heil!" — a Nazi Germany-era salute — as one protester was taken away by security. Another protester was shoved. Read more in NEWS.

6. Bomb-Proof 'Bag' Tested in Hold of Airliner

A controlled explosion in the luggage hold of an aircraft was successfully contained by a bomb-proof lining called a Fly-Bag. The technology, developed by an international team of scientists, shows how a plane's luggage hold may be able to contain the force of an explosion if a device hidden in an item of luggage detonates. Read more in NEWS.

7. Saudi Arabia Announces Military Alliance Against Terrorism

Saudi Arabia on Tuesday announced the formation of a 34-state Islamic military coalition to combat terrorism, including Arab countries such as Egypt, Qatar, the United Arab Emirates, along with Islamic countries. U.S. officials have made clear that they think Gulf Arab states should do more to aid the military campaign against ISIS. Read more in NEWS.

Nightly Spotlight: 'Star Wars' Premiere Audience Wowed

"Star Wars" super-fans are already lining up for "The Force Awakens," which opens wide Friday, and those who attended the world premiere Monday night gave the much-anticipated movie rave reviews.

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