Michelle Martin

What does it mean that these extremists are now participating in mainstream politics?

The crash, which occurred over the Potomac River, killed 67 people. We're also beginning to learn the identities of some of the crew on those aircraft.

The crash, which occurred over the Potomac River, killed 67 people. We're also beginning to learn the identities of some of the crew on those aircraft.

The crash, which occurred over the Potomac River, killed 67 people. We're also beginning to learn the identities of some of the crew on those aircraft.

It has erupted into a fierce national debate over the degree to which the country should allow its most extreme political elements into mainstream politics. And at the center of this debate is the man who is the frontrunner to become Germany's next chancellor.

It has erupted into a fierce national debate over the degree to which the country should allow its most extreme political elements into mainstream politics. And at the center of this debate is the man who is the frontrunner to become Germany's next chancellor.

It has erupted into a fierce national debate over the degree to which the country should allow its most extreme political elements into mainstream politics. And at the center of this debate is the man who is the frontrunner to become Germany's next chancellor.

Nuclear weapons testing might seem like a relic of the Cold War.

Nuclear weapons testing might seem like a relic of the Cold War.

Nuclear weapons testing might seem like a relic of the Cold War.

As all this is happening, NPR's Jeff Brumfield got an extraordinary look inside America's program to maintain its nuclear weapons. And he's with us now to tell us more about it. Jeff, good morning. Good morning. So just start out by telling us where you went and what you saw.

As all this is happening, NPR's Jeff Brumfield got an extraordinary look inside America's program to maintain its nuclear weapons. And he's with us now to tell us more about it. Jeff, good morning. Good morning. So just start out by telling us where you went and what you saw.

As all this is happening, NPR's Jeff Brumfield got an extraordinary look inside America's program to maintain its nuclear weapons. And he's with us now to tell us more about it. Jeff, good morning. Good morning. So just start out by telling us where you went and what you saw.

Okay, he said subcritical experiments. Jeff, what does that mean?

Okay, he said subcritical experiments. Jeff, what does that mean?

Okay, he said subcritical experiments. Jeff, what does that mean?

To that point, though, do we know what the Trump administration plans to do with regards to nuclear testing?

To that point, though, do we know what the Trump administration plans to do with regards to nuclear testing?

To that point, though, do we know what the Trump administration plans to do with regards to nuclear testing?

That is NPR's Jeff Brumfield. Jeff, thank you. Thank you.