Martha Stewart and Emeril Lagasse are being sued for hawking knock-off knives on the Home Shopping Network.

FORBES: Martha Stewart, Emeril Lagasse Hit With Multi-Million Dollar Lawsuit

By Monday afternoon, more than 20, 000 people had signed a petition to WhiteHouse.gov calling on the TSA to keep knives off of planes.

CNN: TSA stands by knife decision

Since the Sept. 11, 2001, terrorist attacks there have been no incidents in which terrorists have successfully used sharp objects to take over a plane, which suggests the current policy of keeping even small knives off planes is working, committee members said.

NPR: TSA Stands By Plan To Allow Small Knives On Planes

Those measures include a ban on all knives aboard planes, the elimination of curbside and off-airport check-ins, and the use of federal air marshals.

CNN: Airlines gear up for additional flights