Watch: Parkland survivor David Hogg escorted out of hearing after going off on Republican inaction on guns

David Hogg, a survivor of the mass shooting at Marjory Stoneman Douglas High School in Parkland, Florida, appeared in a House Judiciary Committee hearing on a possible assault weapons ban.

Nikolas Cruz took a rifle into Marjory Stoneman Douglas High School on Valentine's Day in 2018 and killed 17 students and staff members.

The shooter in Parkland used a Smith & Wesson M&P15 Sport II semi-automatic rifle. The M&P in the name stands for "Military & Police."

Hogg said that weapons like the one used in Parkland, the Bushmaster XM-15 semi-automatic rifle used in Buffalo, and the WASR-10 AK-47-style semi-automatic rifle used in El Paso didn't come to the United States from Mexico.

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"They came from the US, and the shooters were inspired by racist, anti-black, anti-immigrant manifestos that rhyme with GOP talking points," he said on Twitter after the incident.

Cruz -- who was 19 at the time -- has already pleaded guilty to 17 counts of first-degree murder and 17 counts of attempted murder for those wounded during the massacre.

The trial is being held to determine his sentence. The death penalty requires a unanimous decision by the jury; Cruz will otherwise be handed life without parole.

The Florida shooting stunned a country accustomed to gun violence and sparked new efforts, led by students from the school itself, to get lawmakers to pass tougher gun control laws.

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Parkland survivors founded "March for Our Lives," organizing a rally that drew hundreds of thousands of people to Washington, DC in 2018.

Thousands turned out for demonstrations organized by the group last month following two other mass shootings: one at a Texas elementary school that killed 19 young children and two teachers, and another at a New York supermarket that left 10 Black people dead.

Those shootings helped galvanize support for the first significant federal bill on gun safety in decades.

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With additional reporting by AFP