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

A look at the key headlines.
Image: A memorial to honor Muhammad Ali, the former world heavyweight boxing champion after he died at the age of 74 on Friday at the Louisville Islamic Center in Louisville
A memorial to honor Muhammad Ali, the former world heavyweight boxing champion after he died at the age of 74 on Friday at the Louisville Islamic Center in Louisville, Kentucky, June 5, 2016.JOHN SOMMERS II / Reuters

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

1. Top Democrats Launch Attack on ‘Fraud’ Trump

Top figures in the Democratic Party pummeled Donald Trump on Thursday as they publicly coalesced around Hillary Clinton for the first time in her push for the White House. The three-pronged attack from President Barack Obama, Vice President Joe Biden and Sen. Elizabeth Warren came on the same day the former and latter formally endorsed Clinton. Read more in POLITICS.

2. Hundreds Claim Trump Stiffed Them in Business

A USA Today analysis published Thursday uncovered 60 lawsuits by ordinary Americans who say Trump and his businesses failed to pay them for their work. Read more in INVESTIGATIONS.

3. Rare Photos Emerge of Muhammad Ali in His Prime

An exhibit that opened this week at the Gordon Parks Foundation features images of the world heavyweight champion boxer from 1966 and 1970. Ali died a week ago, and will be celebrated in his hometown of Louisville, Kentucky, with a procession and multi-faith memorial service Friday. See more in PHOTOS.

4. Map Shows Where Zika Mosquitoes Live in U.S.

Public health officials are bracing for local outbreaks of the Zika virus in the continental U.S. as mosquito season gets under way. Thousands of travelers from Latin America and the Caribbean have already come back infected, officials say. Read more in HEALTH.

5. Does ‘Beautiful Game’ Soccer Have a Gay Problem?

This month's gay pride celebrations coincide with two of the sports world's most high-profile soccer tournaments: Copa America and Euro 2016. Yet while the NFL and NBA have passed the milestone of having openly gay athletes in their top pro leagues, not a single soccer player in either competition has come out as gay. Read more at NBC OUT.

6. Murder Charges in Deaths of Five Michigan Bicyclists

A 50-year-old Michigan man was charged Thursday with five second-degree murder counts in the deaths of three women and two men when a pickup truck slammed into a group of nine bicyclists this week. Read more in NEWS.

7. Prosecutor: Police Driver Gave Freddie Gray 'Rough Ride'

Officer Caesar Goodson's trial on Thursday was the first time prosecutors said the driver meant to hurt Gray, whose death in April 2015 touched off some of the worst riots in Baltimore. Read more at NBC WASHINGTON.

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