A man who lost his daughter in the Feb. 14 massacre wants an end to school shootings.Andrew Pollack says there should have been one school shooting and it should have stopped. “9/11 happened once, and they fixed everything,” he said.But school shootings continue. He wondered how many more children had to be shot.He spoke at the White House on Wednesday, saying his daughter was murdered last week.“Shot nine times,” he said.Meadow Pollack, 18, was a senior planning to attend Lynn University in Boca Raton, Florida.She was one of 17 people killed during the shooting at Marjory Stoneman Douglas High School in Parkland, Florida.“I’m very angry that this happened because it keeps happening,” Pollack said. “We as a country failed our children. This shouldn’t happen.”He said he can’t even bring a water bottle on planes, noting changes the country took with security.“It stops here with this administration and me,” he said. “I’m not going to sleep until it’s fixed.”During his visit in Washington, he noticed a security guard in a Department of Education elevator. “How do you think that makes me feel?” he said. He said he will never see his daughter again.