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

Image: Protesters Face Off Outside Donald Trump Rally
Protesters face-off outside a Donald Trump rally at the Anaheim Convention Center on Wednesday, May 25, 2016 in Anaheim, Calif. A small but vocal group of people protested outside a Donald Trump campaign rally Wednesday in Orange County amid a heavy police presence to guard against a repeat of raucous demonstrations at other Trump events.Michael Goulding / The Orange County Register via AP

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

1. World Leaders ‘Rattled’ by Trump, Obama Says

During a news conference in Japan on Thursday, President Barack Obama said it's "fair to say" world leaders are "surprised" Donald Trump is the presumptive Republican nominee and that "a lot of the proposals that he's made display either ignorance of world affairs or a cavalier attitude." Read more in NEWS.

2. Obama’s Visit to Hiroshima Stirs Mixed Emotions

Obama's historic visit to Hiroshima later Thursday is stirring conflicting emotions on both sides of the Atlantic. The White House has stressed Obama will not apologize for America's use of the bombs when he visits the Hiroshima Peace Memorial Park. Read more in NEWS.

3. What the Email Report Means for Clinton

The topline of the highly critical report by the State Department's inspector general into Hillary Clinton's use of a private email server when she was secretary of state is that she "did not comply with the Department's policies." But what else does the report mean for Clinton? Read more in POLITICS.

4. Trump: I’ve Used ‘Aliases’ in Business to Save Money

Donald Trump said Wednesday he's used "aliases" — including the name of his son, Barron — throughout his career in real estate because "otherwise, they find out it's you, and they charge you more money." Read more in POLITICS.

5. ‘Game On’: Sanders Agrees to Debate Trump

In the latest twist to this unpredictable 2016 presidential race, presumptive Republican nominee Trump and Vermont Sen. Bernie Sanders independently agreed Wednesday night to debate each other. Read more in POLITICS.

6. 1 Dead, 3 Hurt in T.I. Concert Shooting

A man died and three others were wounded in a shooting at a New York City concert venue where the rapper T.I. was scheduled to perform Wednesday night. Read more at NBC NEW YORK.

7. Amber Heard Files for Divorce From Johnny Depp

The actress has filed for divorce from the eccentric star, citing irreconcilable differences after 15 months of marriage. She is seeking spousal support from the Oscar-nominated actor. Read more in POP CULTURE.

Nightly Spotlight

Created by President Woodrow Wilson in 1916, the National Park Service now includes 411 protected areas — including 59 parks — encompassing 84 million acres.