Jon Stewart on Monday lamented that America would not “f---ing do anything” after the October mass shooting at Pittsburgh's Tree of Life Synagogue.

The comedian, who is a frequent critic of President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE, was speaking during a benefit event for wounded veterans Monday night, according to the Daily Beast, and told the audience that “I don’t understand how we’re not doing anything.”

“If other people kill us, as you know, we will make you go to their place forever. It’s basically how Americans learn geography now. But if we kill each other, we do nothing.”

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Stewart was referring to the mass shooting at the Tree of Life Synagogue in the Squirrel Hill neighborhood of Pittsburgh on Oct. 27. Eleven people were killed in the attack. Robert Gregory Bowers has been indicted on 44 counts for the shooting.

During his appearance, Stewart also commented on the Trump administration's planned troop deployment to the southern border, joking to the service members in attendance, “I’m so glad you’re here, I thought you’d be at the border.”

He commented about the administration's focus on the migrant caravan moving from Guatemala through Mexico and toward the U.S.-Mexico border.

“I’m so scared!” he continued. “There’s thousands of sharecroppers coming to America at one to two miles an hour. They’ll be here by April. Oh my God, what are we going to do? Probably let them plant things.”

The Trump administration is set to deploy 7,000 military personnel to the border in anticipation of the caravan's arrival, and the president has suggested the number may rise up to 15,000.