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KNOW IT ALL: Monday's Top Stories at NBC News

A special report on how Donald Trump became the Republican nominee, and other stories we're following today.
Members and supporters of Lesbian, Gay, Bisexual and Transgender (LGBT) communities enjoy at Gay pride event in Chicago, Saturday, June 18, 2016. Gay pride events a victory over fear after Orlando.Nam Y. Huh / AP

Good morning. Here are the stories we're following today:

1. United States of Trump: An Inside Look at the Voters Who Took Over the GOP

Over the course of 10 months, Trump became the GOP’s standard-bearer despite offending large swaths of voters, antagonizing movement conservatives on a variety of issues, and defeating well-funded and experienced Republican rivals from every wing of the party. Only two of the party’s five living presidential nominees — Bob Dole and John McCain — are publicly supporting Trump in the general election. And even as he routed his opponents in Indiana, a full 42 percent of Republican voters in the state said in an exit poll they were “concerned” or “scared” about a Trump presidency. Who voted for this guy? Read the SPECIAL REPORT.

2. What You Need to Know About the Gun Policy Vote

A week after the worst mass shooting in the nation's history and a nearly 15-hour filibuster waged on the Senate floor by Democrats demanding action, the Senate is set to vote Monday evening on four gun control proposals. Read more in NEWS.

3. 50,000 People Attend Vigil for Orlando Victims

An estimated 50,000 people gathered for a candlelight vigil Sunday night to remember the 49 people killed at a gay nightclub in Orlando. Throngs of people packed onto the banks of Lake Eola, near downtown Orlando, holding signs with messages like "Love always conquers hate" and "Free hugs." Read more in NEWS.

4. Cleveland Celebrates First Title in 52 Years

When the Cleveland Cavaliers struggled and fought and eventually emerged triumphant against the Golden State Warriors to win the NBA championship Sunday, they did more than win a title: They ended what has been called a curse. The Cavs' 93-89 win brought Cleveland its first major sports title since 1964, when the Browns beat the then-Baltimore Colts to win the NFL championship — before there was such a thing as a Super Bowl. Read more in SPORTS.

5. Intense Southwest Heatwave Kills Four

Scalding heat killed at least four people this weekend in Arizona and was stoking at least five major wildfires across the desert Southwest, authorities said Sunday. Excessive heat warnings blanketed Southern California and Arizona, where temperatures soared into the triple digits Sunday and were expected to remain there until Monday, according to the National Weather Service. Read more in WEATHER.

6. 'Star Trek' Actor Dies in Freak Car Accident

Anton Yelchin, a charismatic and rising actor best known for playing Chekov in the new "Star Trek" films, has died at the age of 27. He was killed in a fatal traffic collision early Sunday morning, his publicist, Jennifer Allen confirmed to the Associated Press. Read more at NBC LOS ANGELES.

7. Mexico Teacher Protests Against Mandatory Testing Turn Deadly

Violent clashes between police and members of a radical teachers' union on Sunday left six people dead and more than 100 injured, officials said. The teachers from the National Coordinator of Education Workers, or CNTE, are opposed to the mandatory testing of teachers as part of Mexico's sweeping education reform. Read more in NEWS.

Nightly Spotlight: Drug-Emitting Implant Looks to Fight Nation's Opioid Epidemic

There’s a promising new tool, an implant to help Americans fight the craving for opioid painkillers.