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Updated at 3:40 p.m. ET

President Trump is striking a formal blow against the Iran nuclear deal. But he is stopping short of asking Congress to reimpose sanctions on Tehran. Instead, the president is urging lawmakers to pass a new law, spelling out conditions under which sanctions could be reimposed.

Two weeks ago, bump stocks were just an odd-sounding firearm attachment largely unknown outside gun enthusiast circles.

That all changed early last week with the deadly shooting in Las Vegas, where police discovered a dozen of the devices in the shooter's hotel room overlooking the city's neon-lit Strip. Now, Republicans and Democrats in Congress, the National Rifle Association and other pro-gun groups are asking for a fresh look at the legality of bump stocks.

In the wake of the deadliest mass shooting in modern U.S. history, most Americans — regardless of party — favor tightening restrictions on firearms, according to a new NPR/Ipsos poll.

But significant partisan divides remain — and perhaps relatedly, they exist alongside divides in knowledge about guns in America.

Eight-in-10 Americans told the pollsters they favor bans on assault weapons, high-capacity ammunition magazines and "bump stocks," an accessory used by the Las Vegas shooter that allows a semi-automatic rifle to fire like an automatic weapon.

The death toll from a series of blazes in Northern California has reached at least 31 people — making it the deadliest week for wildfires in the state's history. Officials are warning that more deaths are likely.

"We're moving into a recovery phase," Sonoma County Sheriff Rob Giordano said. "That is the reality part of it."

Speaking late Thursday, Giordano said that two more bodies had been recovered as search teams moved into areas where people had been reported missing in the wake of the fires.

Part 2 of the TED Radio Hour episode Manipulation.

About Ali Velshi's TED Talk

Journalist Ali Velshi began his career to "speak truth to power." Now he worries that fake news has subverted the meaning of truth.

About Ali Velshi

Part 3 of the TED Radio Hour episode Manipulation.

About Elizabeth Loftus's TED Talk

Years of research have taught Elizabeth Loftus just how unreliable our memories are. From tweaking a real memory to planting a completely fabricated one, tampering with our minds is surprisingly easy.

About Elizabeth Loftus

Part 4 of the TED Radio Hour episode Manipulation.

About Steve Ramirez's TED Talk

Neuroscientist Steve Ramirez used lasers to enter the brains of mice and edit their memories. He imagines a future where this technology might be possible in humans as well.

About Steve Ramirez

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