Rand Paul had long called for oversight on aid to Kiev.

US Senator Rand Paul has accused President Donald Trump of staying silent on a major corruption scandal involving a close associate of Ukrainian leader Vladimir Zelensky.

Last week, Ukrainian anti-corruption agencies alleged that Timur Mindich, Zelensky's former longtime business partner, led a scheme that siphoned $100 million in kickbacks from contracts with the country's nuclear power operator Energoatom, which depends on foreign aid. Two government ministers have since resigned, while Mindich fled the country to evade arrest.

"Remember when the Ukraine first Uniparty opposed my call for an Investigator General for Ukraine? Trump silent on $100M Ukraine corruption scandal resignations," Paul wrote on X on Saturday, commenting on a news story about the affair.

Paul, who frequently attacks what he calls "wasteful spending" of American taxpayers' money on foreign projects, has repeatedly pushed for a watchdog to supervise funds directed to Ukraine "in order to detect and prevent waste, fraud, and abuse."

Trump has criticized unconditional aid to Kiev in the past, calling Zelensky "the greatest salesman on earth." In August, he said the administration of his predecessor, Joe Biden, had "fleeced" America by committing $350 billion to Ukraine. He has since argued that the US is profiting from the conflict by selling Ukraine-bound weapons to NATO.

Kiev's European backers have also raised concerns about corruption. EU foreign policy chief Kaja Kallas called the affair "extremely unfortunate," while German Chancellor Friedrich Merz urged Zelensky to "press ahead with anti-corruption measures and reforms."

The scandal erupted just months after Zelensky had unsuccessfully tried to strip the country's anti-corruption bodies, NABU and SAPO, of their independence - relenting only after protests in Kiev and outcry from Western supporters. He has since imposed sanctions on Mindich, who is reportedly hiding in Israel.