5 Things to Know This Morning

Sept. 11, 2013— -- Your look at the five biggest and most buzz-worthy stories of the morning.

1. Obama Pleads His Case: 'I Believe We Should Act'
President Obama argued Tuesday night in his national address that he still needs congressional authorization for military strikes against Syria even though it's possible he may not have to use it. He added that the U.S. military would stay at its current posture to keep up pressure on Syrian President Bashar al-Assad and prepare to strike if this last-ditch diplomatic overture fails.

2. Blast Hits Foreign Ministry in Benghazi
A car bomb exploded today near Libya's Foreign Ministry building in Benghazi, one year after an attack there killed the U.S. ambassador and three other Americans, security officials said.

3. Flight 93 Memorial to Honor Sept. 11 Victims
The Flight 93 National Memorial will honor victims of the September 11 attacks today with a bell-ringing ceremony at 10:03 a.m., the time when United Flight 93 crashed in a Pennsylvania field, killing 33 passengers and seven crew members.

4. Official: 19 Firefighters Possibly Saved Had Air Tankers Responded
The 19 firefighters who died in the Yarnell wildfire in Arizona this summer might have survived had any of the six U.S. Forest Service air tankers requested by the state arrived on the scene, a senior fire official told ABC News.

5. De Blasio Leads Democratic Primary in NYC Mayoral Race
New York City mayoral candidate Bill de Blasio captured the most votes in last night's Democratic primary. Scott Stringer, the Manhattan borough president, won the comptroller primary.