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Analyst and former homeland security adviser fran townsend. also on the phone, dr. sanjay gupta. they mentioned the gun debate, the joint terrorism task force is investigating. it could be more of a political threat than a terror threat, really. >> that's right, anderson, but as you've mentioned, that's not really at the moment the most relevant piece to the investigators. they don't much care about motive at the moment. they want to know who. and so, to determine the who, they will look for the forensics. they'll look for things like saliva, hair, fingerprints on the letter or on the envelope...

Fran townsend. also on the phone, chief medical correspondent dr. sanjay gupta. the letters mention the gun control debate. it could be more of a political threat than a terror threat, really? >> that's right, anderson. as you mentioned, that's not really at the moment the most relevant piece to the investigators. they don't care about motive at the moment, they want to know who. to determine the who, they'll look for forensics, saliva, hair, fingerprints on the envelope. they'll analyze the handwriting, but all these things take time, which is why the first thing they're going to focus on is ...

Control debate. it could be more of a political threat than a terror threat, really? >> that's right, anderson. as you mentioned, that's not really at the moment the most relevant piece to the investigators. they don't care about motive at the moment, they want to know who. to determine the who, they'll look for forensics, saliva, hair, fingerprints on the envelope. they'll analyze the handwriting, but all these things take time, which is why the first thing they're going to focus on is the lab analysis, you heard deb feyerick, the first field test was negative, often times they're wrong, whic...

Homeland security adviser fran townsend sits on the cia and external advisory panels, and dr. sanjay gupta. fran, we have reports the letters mentioned the gun control debate over the joint terrorism task force investigating. it could be more of a political threat than a terror threat. >> that's right, anderson. as you mentioned, that's not really at the moment the most relevant piece to the investigators. they don't much care about motive at the moment. they want to know who. and so to determine the who, they will look for the forensics, things like saliva, hair, fingerprints on the letter or...