At a rally in Las Vegas, site of the largest mass shooting in modern U.S. history, Vermont Sen. Bernie Sanders pledged to take on the National Rifle Association (NRA) if elected president.

Sanders made the vow at a rally Tuesday afternoon.

Former Vice President Joe Biden, vying with Sanders for the Democratic Party presidential nomination, has knocked Sanders for backing a bill to make the gun industry immune from lawsuits in 2005. Sanders has since taken a tougher stance against gun rights.

On Tuesday, he vowed to pass universal background checks and an assault weapons ban. Sanders said “the American people and not the NRA” will determine gun policy.

On Oct. 1, 2017, a gunman perched in the window of a hotel on the Las Vegas Strip killed 58 people down below at an open-air music festival. More than 850 people were injured.

The Nevada caucuses are on Saturday. So far, more than 36,000 Democrats have voted in the first three days of a four-day early voting period.

Nevada's Democratic Party is offering early voting for the first time.

About 84,000 people participated in Nevada’s Democratic presidential caucuses in 2016.