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KNOW IT ALL: Thursday's Top 7 Stories at NBC News

A look at the key headlines.
Image: Protesters chanted outside the governor's mansion in St. Paul in the early hours of Thursday after the killing of Philando Castile.
Protesters chanted outside the governor's mansion in St. Paul in the early hours of Thursday after the killing of Philando Castile.David Peterlinz / KARE11

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

1. How Trump Emerged From Decades of GOP Tension

The emergence of Donald Trump as the presumptive Republican presidential nominee is an intricately woven tale: Fifty years of political, economic and cultural changes, exacerbated by the growth of conservative media, the polarization of Congress and, most recently, a crowded political landscape with no clear GOP leader. In chapter two of the United States of Trump, we look at voters fed up with the status quo and looking for a champion. Read more in POLITICS.

2. Trump Goes After Disney for Star on ‘Frozen’ Book

Shortly after Trump lamented publicly that his social media team replaced a tweet originally featuring a symbol resembling the Star of David, the presumptive GOP nominee posted a photo Wednesday of a "Frozen" sticker book with a similar symbol. Read more in POLITICS.

3. Did Clinton Get Off Easy Compared to Past Probes?

The Hillary Clinton email scandal has drawn comparisons to a number of other investigations into the mishandling of government secrets. And some of these cases may come up Thursday, when FBI Director James Comey testifies before the House Oversight Committee. Read more in POLITICS.

4. Traffic-Stop Shooting Aftermath Streamed on Facebook

Protests erupted in Minnesota overnight Tuesday after a man was fatally shot by police during a traffic stop in front of his girlfriend and a child. Read more in NEWS.

5. Store Owner Has New Video of Alton Sterling Shooting

The owner of the convenience store where Alton Sterling was killed said Wednesday he believes the man was "murdered" by the two white Louisiana cops who shot him. Read more in NEWS.

6. Chelsea Manning Hospitalized, Cut Off From Attorneys

Attorneys for the imprisoned transgender soldier Chelsea are livid following failed attempts to contact their client after she was briefly hospitalized on Tuesday. Read more in NEWS.

7. Cops Hunt ‘Evil’ Killer Preying on San Diego Homeless

The attacks, described as "senseless" and random by homicide investigators, have renewed efforts to identify a person of interest sought following the killing of a homeless man Sunday. Read more at NBC SAN DIEGO.

Nightly Spotlight

A new study published Wednesday found that 40 percent of 65 sunscreen products with the highest customer reviews on Amazon did not meet dermatologists' requirements.