WASHINGTON D.C (VINnews) – Miriam Adelson, a billionaire casino executive and major Republican donor, gave $40 million to two super PACs aligned with GOP congressional leaders in the first three months of 2026, bolstering the party’s midterm campaign funds as it seeks to keep control of both the House and Senate.

The contributions, disclosed in Federal Election Commission filings, included $30 million to the Senate Leadership Fund and $10 million to the Congressional Leadership Fund. The Senate Leadership Fund described the $30 million gift as its largest single contribution ever.

Adelson, the widow of the late casino magnate Sheldon Adelson and majority owner of Las Vegas Sands Corp., has long been one of the Republican Party’s biggest financial backers with a focus on pro-Israel causes. The donations make her the GOP’s top individual donor so far this election cycle.

Republicans currently hold majorities in both chambers of Congress following the 2024 elections. The party is defending its majorities in November’s midterms amid competitive races in the House and Senate.

The infusion of cash arrives as both parties intensify fundraising ahead of the November contests. The Senate Leadership Fund and Congressional Leadership Fund are independent expenditure groups that can raise and spend unlimited sums to support Republican candidates.