the U.S. saying it now has evidence that Syria has used chemical weapons on its own people.

 

President Obama has said many times that would be a red line for the U.S. to take action.

 

But is the evidence strong enough? A question for ABC's Martha Raddatz, joining us, now, in Washington with more. Good morning to you, Martha. 

 

Martha: Good morning, Josh.

 

The language in this assessment is the strongest we have seen. And very specific. The white house saying, that the intelligence community believes that the Syrian regime has used the nerve agent serin on a small scale.

 

That's an agent that paralyzes and suffocates its victims, but there are many caveats in the statement.They make clear that there's a varying degree of confidence that sarin was used and basically want more tests to prove it.

 

So this seems a red line, Josh,

 

that still has shades of gray. 

 

Josh: But a red line never the last mark.

 

This is something again the president had been very clear about in the past.

 

Martha: President Obama did say one point there will be enormous consequences if president decided to use chemical weapons,

 

but we are talking about the possibility of the military action in Syria or a no-fly zone so the administration is not rushing into this.