Sheldon Adelson gives $1.2M to super PAC supporting McCain
© Victoria Sarno Jordan

Billionaire Sheldon Adelson made a $1.2 million donation to a super PAC linked with Sen. John McCainJohn Sidney McCainPublisher announces McSally book planned for May release Democrats lead Trump by wide margins in Minnesota Here's what to watch this week on impeachment MORE (R-Ariz.), according to ProPublica.

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Adelson made the donation to the Arizona Grassroots Action PAC, which is aligned with the Arizona senator, in mid-August.

Republican donors Paul Singer and Sam Fox also made sizable donations to the super PAC, giving $250,000 each.

A recent poll by Emerson College showed McCain leading the Senate race in Arizona, up by 16 points over his Democratic challenger, Rep. Ann KirkpatrickAnn KirkpatrickSwing-seat Democrats oppose impeachment, handing Pelosi leverage McSally gets new primary challenger Two Democrats vow to press forward on Trump impeachment MORE.

Adelson has been a major donor to Republican candidates up and down the ballot. He spent about $100 million on Republicans in 2012.

He endorsed Republican presidential nominee Donald TrumpDonald John TrumpTrump says he doesn't want NYT in the White House Veterans group backs lawsuits to halt Trump's use of military funding for border wall Schiff punches back after GOP censure resolution fails MORE in May but has been slow to fork over the millions of dollars he has given to presidential candidates in the past. It was reported last month that he planned to donate $5 million to support Trump, although it's not clear if the money has reached the campaign yet.

He has this cycle focused his deep pockets on helping down-ballot Republicans, especially in the Senate, which would be easier for Democrats to reclaim.

In August, Adelson and his wife gave $20 million to the Senate Leadership Fund, a super PAC linked with Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellTrump urges GOP to fight for him Senate Dems signal they'll support domestic spending package Trump's top picks for Homeland Security chief are ineligible for job: reports MORE (R-Ky.). The fund is working to preserve and expand the chamber's GOP majority.

He has also given $1.5 million to a group helping Republican Sen. Kelly AyotteKelly Ann AyotteGOP fears Trump backlash in suburbs Trump makes rare trip to Clinton state, hoping to win back New Hampshire Key endorsements: A who's who in early states MORE hold her New Hampshire seat. 

Adelson reportedly planned to spend some $45 million on the 2016 races.