Former MSNBC host Keith Olbermann launched a diatribe against the National Rifle Association for "enabling" attacks like the one in Las Vegas on Sunday night that left more than 50 people dead and at least 500 injured.

Olbermann, in the latest clip for his series "The Resistance," said the Second Amendment was originally written "to keep federal government from taking away the right of each state to maintain its own militia."

It has since transformed "into an excuse for why madmen of whatever heritage or political purpose cannot be stopped from carrying at least 10 long rifles into a hotel room in Las Vegas and setting up a sniper's nest and killing people," Olbermann continued.

He said groups like the NRA should be "branded for what it is — a terrorist organization."

Las Vegas police found 42 guns in Stephen Paddock's possession after he opened fire on a country music concert in Las Vegas.

The motive of the shooter is still unknown, but police believe he acted alone in what has become the deadliest mass shooting in U.S. history.

Olbermann said it's "time to end the lies about the Second Amendment."

"It is time to end refusing to call mass murderers who do not have obvious political motives ‘terrorists.' It is time to end the National Rifle Association. And it is time to end the career of any political figure who made his way to the White House dog whistling to his Second Amendment people," Olbermann said.