Sen. Cory Booker Cory Anthony BookerSunday shows preview: Lawmakers prepare for SCOTUS confirmation hearings before election The movement to reform animal agriculture has reached a tipping point Watchdog confirms State Dept. canceled award for journalist who criticized Trump MORE (D-N.J.) on Sunday called on his fellow officials to “be mindful of what we're saying” following a week of political violence.

"We need to understand that words matter,” Booker told reporters, according to NJ.com.

The Democrat’s comments come after pipe bombs were mailed to his office and those of a number of other prominent Democrats, and after a gunman killed 11 worshippers at a Pittsburgh synagogue.

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Booker addressed a group of New Hampshire Young Democrats at the University of New Hampshire, and spoke to reporters after that speech.

Booker noted that white supremacists are “using the rhetoric of leaders in this country in their propaganda,” according to NJ.com.

Booker condemned the shooting in a tweet Sunday morning, saying that his “heart is broken” over the shooting, which is believed to be the deadliest anti-Semitic attack in US history.

“We must counter this hate with love and love's public face which is justice — tireless work for justice and peace,” he wrote.