The most powerful gun lobby group in the United States is facing a backlash on two fronts.

The National Rifle Association (NRA) has been criticised for not condemning the police shooting of an African American registered gun owner and for releasing a controversial promotional video.

Protesters questioned why the NRA had not taken stronger action over the killing of Philando Castile, a black motorist who told police he had a registered gun, before being shot dead during a traffic stop last year. 

The police officer who shot Castile was acquitted of manslaughter and other charges in June. 

Some of NRA’s own members are now questioning its message.

Al Jazeera's Diane Eastabrook reports from Washington, DC.

US & Canada, Politics