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KNOW IT ALL: Wednesday's Top 8 Stories at NBC News

A look at the key headlines.
Image: Pokemon Go is displayed on a cell phone
Pokemon Go is displayed on a cell phone in Los Angeles on Friday, July 8, 2016.Richard Vogel / AP

Good morning. Here are some of the headlines we're following this morning:

1. This ‘Bloody Difficult Woman’ Set to Be U.K.’s New Leader

Theresa May takes over as Britain's prime minister Wednesday, tasked with steering the country through the Brexit crisis. The steely 59-year-old replaces David Cameron, who became the first political casualty of last month's referendum when he announced his intention to quit hours after the result. Read more in NEWS.

2. Trump Calls for Justice Ginsburg to Resign

Presumptive Republican presidential nominee Donald Trump fired back at Supreme Court Justice Ruth Bader Ginsburg after she expressed fear over a Trump presidency in interviews. In a tweet, Trump called Ginsburg's public statements in recent days "dumb" and said "her mind is shot — resign!" Read more in POLITICS.

3. Paul Ryan on Trump: The Good Outweighs Bad

Republican House Speaker Paul Ryan defended his decision Tuesday to support Trump, disagreeing with the candidate on several issues but saying that refusing to back Trump amounts to supporting Hillary Clinton. Read more in POLITICS.

4. Dallas Gunman Was 'Klutzy,' 'Goofy' While in Army

Micah Johnson, the gunman who killed five police officers during a Dallas protest march last week, was "klutzy" and "goofy sometimes" when serving in the military, according to his one-time squad leader in an interview that will air on TODAY on Wednesday. Read more in NEWS.

5. Manhunt, Arrests in Alleged Plot to Kill Cops

A suspect remains at large in an alleged plot to kill officers after the fatal police shooting of Alton Sterling at a Louisiana store, authorities said Tuesday. Read more in NEWS.

6. How Richard Speck’s Rampage Changed a Nation

Fifty years ago, Speck barged into a Chicago townhouse where a group of student nurses were living and proceeded to torture and murder eight of them. The crime horrified the country — and it introduced a term to the American public that has since then become all too familiar: random mass murder. Read more in NEWS.

7. What Is Driving the Pokémon Go Craze?

Adults and kids have embraced their inner Pokémon fanatics following the release of the free Pokémon Go smartphone app. The mobile Nintendo game, which now has more daily U.S. users than Twitter, has brought the cartoon pocket monsters to life. But for the uninitiated, what's all the fuss about? Read more in TECH.

8. Oldest Park Ranger Goes Back to Work After Attack

About three weeks after she was brutally attacked and robbed in her Richmond apartment, Betty Reid Soskin is set to return to work. Read more at NBC BAY AREA.