Thomas Gunderson sustained a gunshot wound to his leg during the deadliest mass shooting in U.S. history in Las Vegas this weekend, but insisted on standing when President Trump entered his hospital room Wednesday.

On Sunday night a gunman killed at least 59 people, and another 515 people were injured either from gunshots or the crowd’s rush to get away during the massacre. From the window of a hotel room on the 32nd floor of the Mandalay Bay Resort and Casino, the shooter targeted the approximately 22,000 attendees of a country music concert. President Trump and First Lady Melania Trump visited survivors on Wednesday, including Gunderson, who stood when they entered the hospital room where he is recuperating after getting shot in the leg.

"I will never lie down when the President of this great country comes to shake my hand."

– Thomas Gunderson, survivor of the Vegas massacre pic.twitter.com/HeuBCuK7d6 — Chad (@ChadKubisNC) October 4, 2017

“I will never lie down when the President of this great country comes to shake my hand!” Gunderson wrote on his Facebook page. “There may be plenty of issues in this country but I will always respect my country, my president and my flag. Shot in the leg or not, I will stand to show my President the respect he deserves!”

Many stories of bravery emerged in the aftermath of the shooting, including details of the unarmed security officer who survived a hail storm of more than 200 rounds by the gunman after discovering the shooter’s whereabouts. When Jesus Campos approached the hotel room where the shooter was holed up, he was shot in the leg through the door. Despite his wound, Campos helped police officers clear nearby hotel rooms and is also recovering.