A video shared on social media shows Cruz standing stoically at Uptown Sushi in Houston as a man challenges him to support background checks on gun sales, which the Texas senator and many of his Republican colleagues have rejected.

“Why did you come here to the convention?” the man, later identified as Benjamin Hernandez, asked Cruz. “Why? When 19 children died!”

As Hernandez is pulled away by security officials, he said to Cruz, “That’s on your hands! That’s on your hands, Ted Cruz! That’s on your hands!”

Cruz waves him goodbye before rejoining his family at their table.