Iran

Updated on Saturday at 3:01 p.m.

With the State Department facing continued questions over the treatment of Marie Yovanovitch before she was recalled as U.S. ambassador to Ukraine, Secretary of State Mike Pompeo would not say on Friday whether he owed the career diplomat an apology.

"I've defended every single person on this team," Pompeo said in an interview with NPR. "I've done what's right for every single person on this team."

Eight U.S. troops diagnosed with traumatic brain injury (TBI) arrived in the U.S. on Friday, according to Pentagon spokesman Jonathan Hoffman.

Hackers linked to Iran are probing American companies for vulnerabilities, cybersecurity researchers and U.S. government officials say.

The warnings suggest that the next phase of hostilities between the U.S. and Iran, following the Jan. 3 killing of a top Iranian general in an American drone strike, is likely to play out in cyberspace.

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More Americans disapprove than approve of President Trump's handling of the situation with Iran, according to a new NPR/PBS NewsHour/Marist Poll. But they are split along party lines, and the results largely reflect the president's approval rating.

By a 49%-42% margin, Americans disapprove of Trump's handling of Iran. Usual splits emerge, with roughly 9 in 10 Republicans approving, more than 8 in 10 Democrats disapproving and about half of independents disapproving.

The 2015 Iran nuclear deal, already teetering after the U.S. withdrawal and subsequent breaches by the Iranian government, has suffered yet another grave blow.

The conflict between the United States and Iran has flared dangerously in Iraq — and in few places more so than a remote desert air base, more than 100 miles northwest of Baghdad. Iran fired at least 10 ballistic missiles at the sprawling Ain al-Assad base last week in response to the Jan. 3 U.S. drone strike in Baghdad that killed top Iranian commander Maj. Gen. Qassem Soleimani and an Iraqi paramilitary leader.

NPR international correspondent Jane Arraf and freelance photographer Alexander Tahaov were among a group of journalists invited to tour the base earlier this week.

Updated at 3:50 p.m. ET

Iranian authorities have arrested an undisclosed number of people over the accidental shootdown of a Ukrainian airliner. The move comes as Iranians continue to protest against the government over the tragedy. Hours after the arrests, a new video emerged that purportedly shows two missiles hitting the passenger jet.

Update at 3:30 p.m. ET

We're up to the seventh debate, and down to six candidates.

The leading Democratic presidential candidates return to the debate stage Tuesday at 9 p.m. ET — this time in Iowa, which hosts the first-in-the-nation caucuses in less than three weeks.

Defense Secretary Mark Esper says the U.S. has the constitutional authority to strike Iranian proxies in Iraq and Iran on the Islamic Republic's home soil in retaliation for attacks on American forces.

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