Philip Ewing

Updated at 4:12 p.m ET

The phone call with Ukraine's president that President Trump has repeatedly characterized as "perfect" was called "improper" by a National Security Council staff member who testified Tuesday in the House impeachment probe of President Trump.

House Democrats began the second week of their open impeachment hearings on Tuesday with witnesses who listened firsthand when President Trump spoke with President Volodymyr Zelenskiy on July 25 — a key moment in the Ukraine affair.

Tim Morrison, the former top Russia official on President Trump's National Security Council, testified to House investigators that Gordon Sondland, the U.S. ambassador of the European Union, was leading an effort to get Ukraine to reopen an investigation into a company with ties to the son of former Vice President Joe Biden.

Updated at 4:30 p.m. ET

The former U.S. ambassador to Ukraine told Congress on Friday she was recalled after a smear campaign led by President Trump's allies — and Trump criticized her on Twitter even as she testified live on television.

Ambassador Marie Yovanovitch appeared at Democrats' second open impeachment hearing to discuss her career and the circumstances under which her posting to Kyiv was prematurely halted earlier this year.

Updated at 5:21 p.m. ET

A State Department staffer overheard President Trump asking a top diplomat about "investigations" he wanted Ukraine to pursue that he believed might help him in the 2020 election, another senior diplomat told Congress.

That staffer is expected to tell his story directly to House investigators at a closed-door deposition on Friday.

The new subplot about the overheard phone conversation was one of a small number of new details to emerge from Democrats' first open hearing in their impeachment inquiry into Trump on Wednesday.

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

Updated at 5:33 p.m. ET

House Democrats won an important victory in federal court on Friday when a judge ordered the Justice Department to surrender now-secret material from the Russia investigation — and, more broadly, validated the impeachment inquiry into President Trump.

Updated at 4:37 p.m. ET

The Justice Department's review of the origins of the Russia probe has become a criminal investigation, a source familiar with the matter confirmed to NPR.

It is unclear what prompted the shift from an administrative review to a formal criminal investigation, when the change took place or what potential crime is under investigation.

The change drew immediate criticism from Democrats, who have accused Attorney General William Barr of turning the Justice Department into a political weapon for President Trump.

President Trump outlined his Ukrainian pressure strategy directly to a top diplomat who was described as being charged with helping to execute it, another key diplomat told House investigators this week.

Meanwhile, sources in the Ukrainian capital told two U.S. news agencies that Kyiv had been pressured directly about American assistance in the spring.

So it was another big week in House Democrats' impeachment investigation of Trump and the Ukraine affair — and for Republicans' increasingly aggressive defense of the president.

Here's what you need to know.

House Democrats are set to resume their impeachment inquiry on Tuesday with a deposition from another diplomat who appeared uneasy with President Trump's strategy to pressure Ukraine for political help.

Ambassador William Taylor, who has been serving as the interim head of the U.S. diplomatic mission to Kyiv, is scheduled to talk behind closed doors with members and staff of the Intelligence, Foreign Affairs and Oversight committees.

President Trump deputized lawyer Rudy Giuliani to run a shadow foreign policy for Ukraine outside the State Department, witnesses told Congress this past week — and the White House said people should "get over it."

It has been a busy week. Here's what you need to know about the latest in the Ukraine affair and the impeachment investigation.

Mister mayor

Giuliani has been an important figure in Trump world for years, but what investigators heard was how central he was in the plan to get Ukraine's government to launch investigations that Trump wanted.

Each week — and some days, it seems, each hour — brings more clarity to the picture of the Ukraine affair and the political crisis it sparked in Washington over impeachment.

But some of the biggest questions still don't have answers.

Here's a look at where the saga stands, what investigators want to learn and what major decisions still must be reached before the fever breaks.

The Ukraine affair

No one disputes the basic outlines of the Ukraine affair, including President Trump:

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