Hillary Clinton campaign trail February

Chelsea Clinton, left, speaks while Democratic presidential candidate Hillary Clinton, center, and former President Bill Clinton listen during a rally Friday, Feb. 19, 2016, in Las Vegas. (AP Photo/John Locher)

Democratic presidential candidate Hillary Clinton is launching another attack on her primary opponent, Bernie Sanders, over his record on gun rights.

The Clinton campaign is sending out two mailings to Massachusetts voters this week focusing on gun control.

One mailing features a picture of former Congresswoman Gabby Giffords, who was badly injured in a shooting in Arizona. It quotes Giffords praising Clinton, the former first lady, U.S. senator and secretary of state, as "the only candidate I trust to stand up to the corporate gun lobby's intimidation and bullying." The other features a picture of Clinton urging action on gun violence.

Both mailings go on to contrast Clinton and Sanders' records. They write that Sanders, a senator from Vermont, voted against the Brady Bill, which established background checks and waiting periods for gun buyers. Sanders has explained his votes by saying he believed waiting periods should be established by the states, not the federal government, and he was following the will of his constituents.

The mailers attack Sanders for voting to give gun manufacturers liability from lawsuits, though Sanders has since changed his position. They refer to a vote Sanders took in favor of a provision in a bill shortening the time a person must wait to buy a gun if a background check is not completed.

Sanders' Massachusetts spokesman did not immediately respond to a request for comment on the new mailers.

The Clinton campaign has been pushing the same line of attack in several recent events in Massachusetts, which holds its presidential primary on Tuesday.

Hours before Sanders was scheduled to campaign in Amherst on Monday, the Clinton campaign got Holyoke Mayor Alex Morse and Hampden County Sheriff Michael Ashe to hold an event in Springfield slamming Sanders' record on gun legislation.

Also Monday, Massachusetts Attorney General Maura Healey participated in a Clinton campaign conference call with Connecticut Gov. Dan Malloy attacking Sanders' gun record. During that call, Healey said Sanders "hasn't shown any interest in holding gun dealers and manufacturers responsible" for gun violence and has not released a plan for addressing gun violence.

Malloy also plans to campaign for Clinton on Thursday at the Student Prince Cafe in Springfield, where he is again expected to criticize Sanders' record on gun legislation.