The ominous remark "we can't ignore that" takes on added emphasis with Rice sitting on the Homeland Security Committee.
Rice had been feuding with NRA spokeswoman and fisting denier Dana Loesch over the organization's silence on the murder of Castile, a licensed gun owner who was shot during a traffic stop when he told a police officer he had a licensed weapon.
One user replied to Rice, saying that it was not the NRA but the MS-13 gang which were a domestic security threat to her constituency.
Loesch, a white woman, also said that things might have gone differently if she'd been in Castile's shoes, because she'd taken classes on how a concealed carry holder should act around police.
"So if a white guy was shot dead during a routine stop w/ a legal gun & a joint in his vehicle, #NRA would stay silent?"
Loesch then challenged the Democrat that not only threatened her right to free speech but endangered her and her family.
"I am not sure what the protocol is after someone is deemed a domestic threat", Loesch said.
"I only have one question for Congresswoman Rice: is she coming to arrest me?"
Coleman Lamb, a spokesman for Rice, said in a statement that the NRA's message has veered away from protecting Second Amendment rights and is instead stoking unrest.
"A spokesperson for Rep Rice counters that the NRA is ".actively encouraging violence against political activists and the free press.
She also asked Rice what made her think that she and other members of the NRA were a threat to domestic security.
The NRA hadn't spoken about Castile's death for almost a year, until last month during an appearance on cable channel CNN when Loesch called the incident "a bad tragedy that could have been avoided". "Stop lying", Mrs. Loesch said while discussing the incident on Twitter.
But some of Rice's sharpest comments come on Twitter.style="text-align: center;"