The National Rifle Association has banned its members from carrying their firearms during its annual forum while US President Donald Trump and his deputy Mike Pence are in attendance.
A White House official said that Mr Trump is expected to attend the event in Dallas on Friday, with Mr Pence set to speak at the NRA's leadership forum on the same day.
The NRA has said on its website that the US Secret Service will be responsible for security when the two politicians are at the event.
Some students and their families from Parkland, the Florida high school where 17 people were killed in February, criticised the NRA on social media for what they said was hypocrisy.
David Hogg, a student at Marjory Stoneman Douglas High School, who has pushed for stricter gun control since the shooting, said:
Guns were also banned during Mr Trump's appearance at the NRA's annual meeting in Atlanta last year.