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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:

Group Health Cooperative in Seattle, one of the United States' oldest and most respected nonprofit health insurance plans, is accused of bilking Medicare out of millions of dollars in a federal whistleblower case.

Sounding like a huge swarm of angry bees or maybe a hedge trimmer on steroids, a small quadcopter lifts up off of a landing pad in front of the main hospital building on the WakeMed campus in Raleigh, N.C. Underneath it is a metal box — smaller than a shoebox — with vials of blood samples inside of it that are now heading across the campus to the lab for analysis, guided by a drone operator on the ground.

It's not a long trip.

In its highest register, Caroline Polachek's voice sounds like it might have slipped loose from the circuits of a synthesizer. It lifts skyward on "Bruises," the breakout single from her former band Chairlift, which more than 10 years ago first got its hooks in listeners by way of an iPod commercial.

President Trump fired him (after he submitted his resignation) and earlier this week reportedly called him "the world's most overrated general," but former Defense Secretary Jim Mattis had a few barbs of his own to sling in a speech he gave in New York on Thursday.

Delivering the keynote address at the 74th Alfred E. Smith Memorial Foundation Dinner, Mattis — a retired four-star U.S. Marine general — said he felt he had finally "achieved greatness."

"I'm not just an overrated general, I am the greatest, the world's most overrated," he said to laughter.

E-cigarette maker Juul Labs announced Thursday it will suspend sales of most of its flavored products, including mango, fruit and cucumber. These types of flavors are considered an on-ramp to vaping for teenagers.

The move comes as the industry faces immense scrutiny. Several states have instituted bans on flavored products, and the Trump administration has signaled that a federal ban may be in the works.

The European Union and the United Kingdom reached a new Brexit agreement on Thursday, and while it appeared to mark a big breakthrough in the years-long process, the saga doesn't end here.

The withdrawal deal still needs approval in both the U.K. and European parliaments. Although EU leaders unanimously endorsed it in Brussels on Thursday, it faces stiff opposition in Britain's Parliament, which has voted down three previous Brexit deals.

The U.K. is scheduled to leave the EU on Oct. 31.

Updated at 6:30 p.m. ET

Secretary of Energy Rick Perry plans to leave his position at the end of the year, President Trump confirmed to reporters Thursday in Fort Worth, Texas. Trump praised Perry and said he already has a replacement in mind.

"Rick has done a fantastic job," Trump said. "But it was time."

Trump said that Perry's resignation didn't come as a surprise and that he has considered leaving for six months because "he's got some very big plans."