Philip Ewing

Philip Ewing is NPR's national security editor. He helps direct coverage of the military, the intelligence community, counterterrorism, veterans and other topics for the radio and online. Ewing joined the network in 2015 from Politico, where he was a Pentagon correspondent and defense editor. Previously he served as managing editor of Military.com and before that he covered the U.S. Navy for the Military Times newspapers.

Republicans on the House intelligence committee gave President Trump another clean bill of health this week.

And the committee's Democrats laid out how much they say he has to fear.

What are "active measures?"

The Russian government launched a broad influence campaign against the United States starting in 2014. Intelligence professionals call it the latest examples of "active measures," secret tools of statecraft that have been used for centuries. They included many interlocking elements:

What is obstruction of justice?

It's against the law to frustrate or try to frustrate an investigation, even if no underlying crime was committed. Lying to federal investigators is a crime on its own and so is acting more broadly to prevent or delay or otherwise interfere with the course of their work.

It's also politically important: The last two occasions on which Congress has filed articles of impeachment against sitting presidents — against Richard Nixon and later, Bill Clinton — they included allegations about obstruction.

Why is President Trump's campaign being investigated for potentially conspiring with the Russian attack on the 2016 election?

Because of something that happened early in 2016: Trump, a political newcomer who had never served in the military or held elective office, was criticized for his lack of experience and faced pressure to name the team that would advise him on national security and foreign policy. Once he did, people on it began to receive overtures from Russians or their agents.

This week in the Russia investigations: Did we learn anything from James Comey? Michael Cohen opts for discretion in the face of some new legal challenges.

What Comey Says Trump Said Putin Said

President Trump, then-chief of staff Reince Priebus and then-FBI Director James Comey were sitting together in the Oval Office. Trump, in Comey's telling, was monologuing, as the former FBI director says he often did.

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