The investigation into the Las Vegas shooting is still in the early stages, yet there already is a familiar debate about whether to call it an act of "domestic terrorism."
"It was an act of pure evil," President Trump said — but the president and law enforcement officials have refrained from calling it terrorism.
Several members of Congress, from both parties, did describe the attack as terrorism, including Jim Cooper, a Democrat from Tennessee.
Two key questions crop up every time this debate takes place.
First, what was the attacker's motive?