By Jordan Fabian - 05/05/15 01:17 PM EDT
Sen. Lindsey GrahamLindsey GrahamVulnerable GOP senator questions opponent's American heritage Trump on primary rivals who don't back him: 'I don't know how they live with themselves' The Trail 2016: Who is really winning? MORE (R-S.C.) told reporters he wasn't sure if the claim by ISIS that it was behind the Texas shooting was credible.
"I don’t know. It’s obvious these are ISISL-inspired guys but I don’t know if there’s command and control," he said.
"But I would say this, if there is command and control, that is an ominous turn in the war. I don’t know if it’s all talk by them. But if there’s a command control element to this attack that is not a good thing."