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

A look at the key headlines.
Image: Trump, Lester Holt Nightly News
Nightly News

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

1. Clinton Campaign Hits ‘DEFCON 1’ for Trump

For more than two years, Hillary Clinton has been Democrats' sure-thing next presidential nominee, while Republicans sorted through a messy and expansive field of wannabes. Yet now, she's dealing with an interminable primary, as the GOP's newly-minted presumptive nominee Donald Trump trains his sights on her. Read more in POLITICS.

2. Why a GOP Convention Fight Might Still Erupt

With Trump's path to the Republican party nomination for president wide open, a GOP contested convention is now extremely unlikely. But the party convention in July isn't likely to be a "Kumbaya" moment for the party either. Read more in POLITICS.

3. More Evacuated as ‘Heartbreaking’ Fire Spreads

A vast, intense wildfire that has forced more than 88,000 people to flee the Canadian oil city of Fort McMurray was spreading overnight, threatening the local airport and engulfing more communities, authorities said. Read more in NEWS.

4. ISIS’s Ouster From Ramadi Comes With Devastating Cost

When Iraqi government forces backed by U.S.-led warplanes wrested Ramadi from ISIS militants after eight months of ISIS control, it was heralded as a major victory. But the cost of winning the city has been the city itself. Read more in NEWS.

5. Woman Found Alive in Rubble After 6 Days

More than 35 people have been found dead since a six-story structure collapsed in Kenya following heavy rains and floods Friday. The Kenya Red Cross said the woman was still trapped but that she was speaking with rescue workers while they removed debris around her Thursday. Read more in NEWS.

6. Takata Airbag Recall Just Got Even Bigger

The largest safety recall in automotive history is about to get even bigger, with federal regulators ordering embattled Japanese supplier Takata to recall as many as 40 million additional airbags linked to a defect already blamed for at least 11 deaths. Read more in BUSINESS.

7. California Bumps Age to Buy Cigarettes to 21

Under the bill, anyone who gives tobacco or tobacco paraphernalia, including tobacco vending machines, to someone under age 21 could also be found guilty of a misdemeanor crime. Read more at NBC SAN DIEGO.

Nightly Spotlight

Trump spoke with NBC Nightly News' Lester Holt after a resounding win in the Indiana primary and the departures of his last remaining rivals for the GOP nomination.