President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE met with casino magnate and GOP megadonor Sheldon Adelson and his wife Miriam at the White House on Monday, discussing the mass shooting in Las Vegas that left 59 people dead and more than 500 injured.

The Las Vegas Review-Journal reported Tuesday that the meeting at the White House had been scheduled before news of the attack on the country music festival on the Vegas strip reached Washington early Monday morning.

The meeting was intended as a policy discussion, but Trump and the Adelsons reportedly also discussed how to help those affected by the shooting.

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Trump's son-in-law and senior adviser Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE was allegedly also at the meeting.

Adelson, the owner of the Las Vegas Sands casino and resort company, was among Trump's largest donors during the 2016 presidential campaign, giving millions to pro-Trump super PACs.

The meeting on Monday came hours after a gunman opened fire on the music festival from his hotel room at the Mandalay Bay. The shooter, identified as 64-year-old Stephen Paddock, was found dead in the room when SWAT teams stormed the hotel.

The shooting in Las Vegas is the deadliest in modern U.S. history. Trump is expected to visit the city on Wednesday to meet with first responders and the families of victims.

The Adelson family bought The Las Vegas Review-Journal in 2015. Last October, the Review-Journal gave Trump his first major newspaper endorsement.