GOP megadoner Sheldon Adelson might spend as much as $100 million to support Donald Trump’s bid for the White House, according to a New York Times report, while pulling back his funding for down-the-ballot races and other Republican efforts. The casino mogul told Trump he would financially back his campaign at a closed-door meeting last week, two Republicans close to Adelson told the Times, and the amount pledged would exceed Adelson’s spending on previous campaigns.

The move comes as other major Republican donors, including the Koch brothers, have balked at supporting Trump. Trump bragged about being self-financed throughout the primary race (though he was receiving some contributions). He has now said he intends to fundraise for his general election battle with likely Dem nominee Hillary Clinton.

According to the New York Times report, Adelson and his advisors are still weighing which pro-Trump super PAC is best suited for his financial backing. Adelson officially declared his support of Trump in a Washington Post op-ed Friday.

“If Republicans do not come together in support of Trump, Obama will essentially be granted something the Constitution does not allow — a third term in the name of Hillary Clinton,” Adelson said.