Omar Siddiqui Mateen, the gunman who killed 49 people in Sunday's horrific massacre, was an American-born citizen. He was raised in the US and he legally obtained his assault rifle. Mateen did reportedly claim allegiance to ISIS during his attack, but the FBI hasn't found evidence that he received direction from abroad. All evidence available
Americans — Not Foreigners — Have Committed 80 Percent Of Terrorist Attacks In The US Since 9/11
US citizens have committed 80 percent of terrorist attacks since 9/11