President Trump found himself in a familiar place on Friday: imploring his colleagues in government to do something to prevent another shooter from taking the lives of American schoolchildren.

Just after 7:30 a.m. local time Friday morning, a 17-year-old student of Sante Fe High School in Southeast Texas entered the building with a shotgun and a .38 revolver. The gunman, whom law enforcement identified as 11th grader Dimitrios Pagourtzis, killed nine of his peers and one student, and caused serious injuries to several others. Police and FBI officials later discovered several homemade explosive devices at Pagourtzis’ home.