Krishnadev Calamur

Tributes are pouring in for Marlene Sanders, the television news pioneer who died Tuesday at the age of 84.

NPR's Susan Stamberg tells our Newscast unit:

Here's what we know: Julius and Ethel Rosenberg were executed in 1953 for selling U.S. nuclear secrets to the Soviet Union after one of the most sensational Cold War-era espionage trials. They were convicted in 1951 owing, largely, to the testimony of David Greenglass, Ethel Rosenberg's brother.

Here's what we don't know: How credible Greenglass' testimony was in court.

President Obama says there's "no precedent" to revoke the Presidential Medal of Freedom for comedian Bill Cosby, who has been accused by several women of sexually assaulting them.

"There's no precedent for revoking the medal," Obama said at a news conference today. "We don't have that mechanism."

Cosby was awarded the Presidential Medal of Freedom in 2002 for his contributions to television.

Here are Obama's full comments on the allegations against Cosby:

Updated at 7:42 p.m. ET

Greece's Parliament approved the controversial austerity measures struck Monday with the country's creditors, but the vote created a rift within the ruling left-wing Syriza party.

"We don't believe in it, but we are forced to adopt it," Prime Minister Alexis Tsipras appealed to lawmakers before the vote.

The vote was 229-64, with six abstentions. Thirty-two of the "no" votes came from Syriza lawmakers; six of them voted present. Also voting "no" were members of the far-right Golden Dawn.

This post was last updated at 2:54 p.m. ET

President Obama offered a robust defense of the historic deal struck with Iran on its nuclear program, saying it meets the "national security interests of the United States and its allies."

In a more than hourlong news conference, Obama dismissed criticism of the deal, acknowledging that he expects "robust" debate over the agreement in Congress, but urging lawmakers to evaluate "this agreement based on the facts, not on politics, not on posturing."

The Smithsonian's National Museum of African Art in Washington will post a sign Wednesday telling visitors an exhibition that includes art owned by Bill Cosby and his wife, Camille, is "fundamentally about the artworks and the artists who created them, not Mr. Cosby," representatives for the Smithsonian Institution say.

The families of three Americans imprisoned in Iran and the wife of a former FBI agent who vanished in the country in 2007 have said they hope the historic deal the U.S. and five other world powers struck with Iran over its nuclear program will see the men released.

Amir Hekmati

Updated at 12:30 p.m. ET

Reaction in the Middle East to the historic agreement that the U.S. and its five allies struck with Iran on its nuclear program has been mixed.

In Israel, Prime Minister Benjamin Netanyahu's reaction was, as expected, highly critical.

The Pentagon is examining the implications of allowing transgender people to openly serve in the military, Defense Secretary Ash Carter said today.

The executive committee of the Boy Scouts of America has unanimously adopted a resolution that would allow gay adults to serve as Scout leaders, ending a longstanding ban on gay leaders in the organization.

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