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

A look at the key headlines.
U.S. Sen. John McCain, R-Ariz., speaks outside a polling station after voting, Tuesday, Aug. 30, 2016, in Phoenix. McCain is seeking the Republican nomination in Arizona's primary election. (AP Photo/Matt York)Matt York / AP

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

1. Donald Trump to Meet With Mexican President

The Republican presidential nominee will meet with Mexican President Enrique Peña Nieto ahead of a major speech on immigration on Wednesday. The surprise visit comes as Trump is later scheduled to deliver what's billed as a "major speech" on immigration in Arizona. Read more in POLITICS.

2. Prosecutor Probes Trump Campaign CEO’s Voter Record

Florida prosecutors are investigating the voter registration of Trump's campaign chief, NBC News has learned. Election officials in Miami-Dade County confirmed Tuesday that the local state attorney's office requested Stephen Bannon's voter records last week. Read more in POLITICS.

3. McCain, Rubio, Wasserman Schultz Win Primary Fights

Three high-profile incumbents — Florida's GOP Sen. Marco Rubio, Democratic Rep. Debbie Wasserman Schultz and Arizona Republican Sen. John McCain — beat back primary challengers on Tuesday night, having done so despite facing tough opposition. Read more in POLITICS.

4. Vets Rally Behind Embattled NFL Star Over Protest

Veterans took to social media to rally behind Colin Kaepernick after the 49ers quarterback was accused of being anti-military in his protest for racial justice. Read more in SPORTS.

5. Three-Foot Storm Surge Possible Amid Hurricane Watch

A triple weather threat loomed Wednesday with storms set to hit parts of the Gulf Coast, Southeast and Hawaii. North Carolina's Outer Banks will likely be drenched as a tropical weather system blows by with up to 5 inches of heavy rain, forecasters said. Read more in NEWS.

6. Chris Brown Freed on $250K Bail in Gun Case

Brown was arrested Tuesday after a woman claimed he threatened her with a gun, police said. The R&B singer, who previously pleaded guilty to a 2009 felony assault involving then-girlfriend Rihanna, had earlier refused to come out of his home and talk with officers. Read more in POP CULTURE.

7. Facebook Algorithm Replacing Humans Posts Fake News

Facebook's "trending topics," which faced allegations of political bias earlier this year, now requires little-to-no human input, with the company having fired editors who oversaw the feature. That's causing trending topics to veer off course, highlighting a false news story and various other mix-ups. Read more in TECH.

8. Chicago Police Move to Fire Officers in McDonald Case

The officers, including Jason Van Dyke, face administrative charges as the case moves to the Chicago Police Board. Van Dyke shot 17-year-old Laquan McDonald 16 times in 2014, and dashcam footage made public last year sparked protests nationwide. Read more at NBC CHICAGO.