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Commander of the U.S. Strategic Command Air Force Gen. John Hyten (R) testify during a hearing before House Armed Services Committee. Photo: Alex Wong/Getty Images

General John Hyten, head of U.S. Strategic Command, has delivered a classified report overhauling nuclear communications for President Trump that offer "specific new details of top Pentagon leaders' views on nuclear weapons," to Defense Secretary Jim Mattis, CNN's Barbara Starr reports.

Why it matters: Starr details the "changes are critical in the wake of months of tensions with North Korea and uncertainty about Russian intentions. Including conventional military options — such as cyber or missile defense — gives a President specific options in a crisis for de-escalation, something Hyten continues to advocate."

The details: A major change "will be that Hyten will now be the sole senior officer responsible" for Nuclear Command, Control, and Communication Systems, (NC3.) The report detailed "a new method ordered by Mattis on how the [NC3], which allows a US president and top military commanders to communicate with military forces in a nuclear event, will work in the future," Starr explains. The changes will not directly impact launch procedures, but instead but an emphasis on ensuring the readiness and security of the system.

Go deeper

Updated 42 mins ago - Sports

Simone Biles won't compete in individual vault or uneven bars Olympic finals

Photo: Loic Venance/AFP via Getty Images

Simone Biles will not compete in the individual vault or uneven bars finals at the Tokyo Olympics, USA Gymnastics announced Friday.

Why it matters: USA Gymnastics said Biles, who previously withdrew from the individual all-around and team finals to prioritize her mental health, will continue to be evaluated to determine if she'll compete in the balance beam or floor exercise events.

58 mins ago - Sports

American Katie Ledecky wins Olympic gold in women's 800m freestyle

USA's Katie Ledecky reacts after taking gold in the final of the women's 800m freestyle race. Photo: Odd Anderson/AFP via Getty Images

American superstar swimmer Katie Ledecky grabbed her second gold medal of this year's Olympic Games, winning the women's 800-meter freestyle race Saturday in Tokyo.

Driving the news: Ledecky, who holds the world record in the 800m freestyle, is considered one of the best women swimmers of all time. Saturday's final marks her third straight Olympic gold in the event.

1 hour ago - Sports

Caeleb Dressel breaks world record in men's 100m butterfly, wins 3rd gold in Tokyo

Photo: Jean Catuffe/Getty Images

American swimmer Caeleb Dressel broke the world record in the men's 100-meter butterfly final in Tokyo on Saturday, picking up his third gold medal of this year's Games.

The big picture: Dressel finished with a time of 49.45 seconds. Hungary's Kristóf Milák won the silver, and Switzerland's Noe Ponti took the bronze.