Florida’s two U.S. senators say the nightclub shooting in Orlando that appears to be the nation’s worst in history, appeared to be related to radical Islamic terrorism.

“Right now there’s a lot of indications that this has some link to radical Islam,” Republican Sen. Marco Rubio told CNN on Sunday. “I think we have to continue to explain to people, this is the new face of the war on terror. … And it’s a reminder that the war on terror has evolved into something that we never had to confront before.”

President Barack Obama, speaking about 12 hours after the shooting began, said, “W

e

know enough to say this was an act of terror and an act of hate,” and added that his administration

will “resolve to defend our people.”

Obama used his remarks to make yet another call for tighter gun laws, calling it a “further reminder how easy” it is for someone to obtain powerful firearms.

“We have to decide if that’s the kind of country we want to be,” he said. “To do nothing is a decision, as well.”