Sheldon Adelson, the billionaire casino magnate and Republican super PAC donor, contributed $250,000 to Florida Gov. Rick Scott's political committee last week.

The June 5 donation to the 527 group came as Scott fights with the federal government over his effort to purge non-citizens from his state's voter rolls.

On May 9, the Florida Secretary of State's office announced an initiative to check voter rolls against records from the Florida Department of Highway Safety and Motor Vehicles. That effort turned up as many as 182,000 registered voters who might possibly not be U.S. citizens. But some of the state's independent election supervisors doubted the accuracy of the list. State officials requested access to a U.S. Department of Homeland Security immigration database to verify the individuals' citizenship or lack thereof and were turned down.

On Monday, Scott's administration filed a lawsuit to gain access to the database. And on Tuesday, the Justice Department sued Florida to halt the voter rolls purge, citing voting rights laws.

Scott is running for reelection in 2014, although his approval rating has dropped to 31 percent, and his affiliated political committee is already raising big money. The committee brought in more than $1 million in April and more than $720,000 in June so far.

Adelson's donation stands apart from three other six-figure donations to Scott since May because it came from outside the state.

The billionaire's political generosity this month did not end with Scott. He also gave $10 million to the Romney-aligned Restore Our Future super PAC, according to a Wall Street Journal report on Wednesday. Through April, Adelson and his family have given a record $26.5 million to super PACs.