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

Here is what we're following today.
Flowers and candles are disposed on the ground near US and two rainbow flags in front of the US Embassy in Berlin on June 13, 2016 as people pay tribute to the victims of the Orlando killing.JOHN MACDOUGALL / AFP - Getty Images

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

1. Orlando Gunman Probed for Terror Ties but Legally Bought Weapons

How does a man investigated by the FBI for possible links to terrorism buy an assault-style weapon in America? Easily. Omar Mateen used a legally purchased AR-15-style weapon to massacre at least 50 people in an Orlando gay club early Sunday. The FBI had looked into him twice with inconclusive findings — not that a different result necessarily would have mattered. Read more in NEWS.

2. Names, Stories of Massacre Victims Begin to Emerge

Twenty-three of the at least 50 victims of the mass shooting at a gay bar in Orlando had been identified by authorities by early Monday, while more than $1.3 million had been raised by a local LGBT group, Equality Florida, for victims' families, who were trying to make sense of the violence. Read more in NEWS.

3. Gunman Described as Belligerent, Racist, 'Toxic'

Investigators probing the massacre are trying to determine whether terrorism, homophobia or both pushed Mateen over the edge. An ex-colleague told NBC News that the gunman was racist, belligerent and "toxic." Read more in NEWS.

4. Trump Set to Address Terrorism, Clinton Record

Donald Trump faces high stakes Monday — and possible political peril — with a much-touted speech criticizing Hillary Clinton's candidacy that will now also serve as his first public address since Sunday's deadly terror attack in Orlando. Read more in POLITICS.

5. Two Terrorists, One City: Why Gunman Was on FBI's Radar

Both the Orlando gunman and the first American to carry out a suicide attack in Syria had ties to Fort Pierce — a coastal city of under 42,000 in southeastern Florida. They also at one point were thought to be linked to each other. Read more in NEWS.

6. Man Arrested in L.A. With Guns, Explosives in Car

Assault rifles, high capacity magazines, ammunition and chemicals used to make explosives were found Sunday in the vehicle of a man from Indiana, according to Santa Monica police. Despite an earlier report from Santa Monica's police chief, the man did not indicate he was targeting L.A.'s PRIDE festivities, only that he intended to go to the event. Read more at NBC Los Angeles.

7. Lin-Manuel Miranda Highlights Orlando at Tonys

"Hamilton" star Lin-Manuel Miranda brought Broadway to tears with an emotional tribute to the victims of the Orlando massacre at the 70th Tony Awards on Sunday night. "Love is love is love is love is love, and love cannot be killed or swept aside. Fill the world with music, love and pride," he said. Read more in NEWS.

8. Nightly Spotlight: Clinton, Trump Release Dueling Statements on Shooting

Presumptive nominees Hillary Clinton and Donald Trump each weighed in Sunday on the mass shooting at the gay club Pulse in Orlando, which authorities say claimed at least 50 lives. The two took contrasting approaches, reflecting starkly different campaigns and personalities.