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Democratic presidential candidate Beto O'Rourke walks next to his wife Amy Hoover Sanders and Rep. Veronica Escobar Sunday, Aug. 4, 2019, during a silent march holding sunflowers in honor to the victims of a mass shooting occurred in Walmart on Saturday, Aug. 3, 2019, in El Paso, Texas. (Lola Gomez/Austin American-Statesman via AP)

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President Donald Trump speaks about the mass shootings in El Paso, Texas and Dayton, Ohio, in the Diplomatic Reception Room of the White House, Monday, Aug. 5, 2019, in Washington. (AP Photo/Evan Vucci)

The firearm used by the shooter Connor Betts, 22, is projected on a screen during a press conference Sunday, Aug. 4, 2019, about a mass shooting that left left multiple people dead and 26 injured along the 400 block of E. Fifth Street, in Dayton, Ohio. (Albert Cesare/The Cincinnati Enquirer via AP)

FILE - In this March 18, 2019, file photo, mourners lay flowers on a wall at the Botanical Gardens in Christchurch, New Zealand. The El Paso massacre is the latest attack in which the gunman appears to have praised the March shootings in Christchurch, where an Australian white supremacist is charged with killing 51 worshippers at two mosques. (AP Photo/Vincent Thian, File)

Vice President Mike Pence follows President Donald Trump as he walks off after speaking about the mass shootings in El Paso, Texas and Dayton, Ohio, in the Diplomatic Reception Room of the White House, Monday, Aug. 5, 2019, in Washington. (AP Photo/Evan Vucci)

Family members of slain mass shooting victim Thomas "TJ" McNichols, from left, Donna Johnson, aunt, and sisters Jamila and Finesse McNichols, mourn beside a memorial near the scene of the shooting Monday, Aug. 5, 2019, in Dayton, Ohio. (AP Photo/John Minchillo)

Locals bring flowers, stuffed animals, candles and posters to honor the memory of the victims of the mass shooting occurred in Walmart on Saturday morning in El Paso on Sunday, August 4, 2019. (Lola Gomez/Austin American-Statesman via AP)

A woman sits next to a sign with a message that reads: ¨No More Guns! Make Love¨, in Juarez, Mexico, Saturday, Aug. 3, 2019, where people are gathering for a vigil for the 3 Mexican nationals who were killed in an El Paso shopping-complex shooting. Twenty people were killed and more than two dozen injured in a shooting Saturday in a busy shopping area in the Texas border town of El Paso, the state’s governor said. (AP Photo/Christian Chavez)