Depositions are set to begin in Chicago in the lawsuit connected to the deadly shooting at Sandy Hook elementary.
Families of nine victims are suing the gun manufacturer, Remington.
They say Remington should not be able to sell AR-style rifles to civilians.
Remington is the maker of the rifle that was used in the 2012 massacre in Newtown, Connecticut.
The gunman killed 20 students and six staff members before taking his own life.
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