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

Image: Oklahoma City Thunder at Golden State Warriors
Oklahoma City Thunder guard Russell Westbrook (C) goes to the basket as Golden State Warriors forward Draymond Green (L) defends during the NBA Western Conference finals basketball game one between the Oklahoma City Thunder and the Golden State Warriors at the Oracle Arena in Oakland, California, USA, 16 May 2016.JOSE FAJARDO / POOL / EPA

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

1. Majority of Republican Voters Trust Trump Over Ryan

A majority of Republican and Republican-leaners who say they are registered to vote trust Donald Trump over House Speaker Paul Ryan to lead the GOP, according to results from the most recent election tracking poll. Ryan has not endorsed Trump. Read more in POLITICS.

2. Senate Makeup Limits Clinton's VP Choices

At least three of Hillary Clinton's top potential choices for a running mate — Elizabeth Warren, Sherrod Brown and Cory Booker — are senators from states with GOP governors, meaning they would almost certainly be replaced in Congress by a Republican. That could alter the balance of power in the Senate. Read more in POLITICS.

3. SCOTUS Sends Birth Control Case Back to Lower Courts

The U.S. Supreme Court on Monday ducked a ruling on the highly contentious issue of contraceptive coverage for religiously affiliated non-profits, while endorsing the outlines of a potential compromise. It was an outcome dictated by a court of only eight justices who appear evenly split on the central questions in the case. Read more in NEWS.

4. Philly Train Crash Was Likely Caused by Distracted Engineer

The engineer of the Amtrak train that ran off the rails outside Philadelphia in May 2015, killing eight people, was likely distracted by radio dispatches, a source close to the investigation told NBC News on Monday. Read more in NEWS.

5 . 'Wire' Star Regrets That 'Political Discussion Escalated'

"The Wire" actor Wendell Pierce expressed "regret" Tuesday that an argument about politics in a hotel "escalated" to his arrest on a simple battery charge. The 52-year-old was arrested early Saturday at the Atlanta Lowes Hotel and freed Sunday on a $1,000 bond, according to police and court records. Read more in NEWS.

6. Former College Wrestling Star Suspected of Killing Pregnant Wife

A former star wrestler at Wheaton College is suspected of killing his pregnant wife at their suburban Minneapolis home. Yeveginy Savenok turned himself in to police over the weekend, ending a large-scale police search following the stabbing death of his wife. Read more at NBC Chicago.

7. Westbrook Leads Rally, Thunder Stun Warriors to Take Game 1

Nobody saw that coming. Not when the Warriors had only lost two games at home all season. But the Oklahoma City Thunder, powered by Russell Westbrook’s offensive explosion in the second half and some seriously impressive defense, upset the defending champions in Game 1, taking a 1-0 series lead with a 108-102 win. Read more in SPORTS.

Nightly Spotlight: Half of People Who Have Heart Attacks Don't Even Know It

A study found that 45 percent of heart attacks in the U.S. are "silent” — meaning the people having them don't realize they’re happening — and are three times as likely to die of heart disease.