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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.

House Speaker Nancy Pelosi and her lieutenants are turning a new page in their impeachment inquiry this week based on a principle familiar to classics scholars: repetitio mater studiorum.

"Repetition is the mother of all learning."

Updated at 2:21 p.m. ET

White House officials filed the record of President Trump's now-famous call with his Ukrainian counterpart on a "different, more secure system" from the one they normally used, a key witness told House impeachment investigators.

President Trump's friend and political adviser Roger Stone is set to go on trial Tuesday in a proceeding that could reveal just how close Trump world got to the Russian interference in the 2016 election.

Jury selection is scheduled to commence following months of unusual public silence from Stone, who has been gagged by the judge in his case following a flap this year over his posts on social media.

President Trump's efforts to pressure the government of Ukraine didn't sit well with some key members of his administration.

One of them, whose identity remains unverified, felt strongly enough to write down his concerns about the president's actions in a whistleblower complaint to the intelligence community's inspector general.

But he wasn't the only one who spoke up.

House Democrats crossed the Rubicon this week and committed, for the record, to their impeachment inquiry. Although they said impeachment isn't a foregone conclusion, they tried to underscore again that this is serious.

Meanwhile, more confirmations of the facts of the Ukraine affair meant the end of the investigation process may now be in view — and public hearings could be coming next.

Here's what you need to know about the events of a historic week in Washington and what may be around the corner.

Lt. Col. Vindman and Mr. Morrison

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