The United States imposed sanctions on a senior member of the Hungarian government for alleged corruption, the U.S. Treasury said on Tuesday, a move Budapest said it would challenge when President-elect Donald Trump takes power.

By Tamas Csonka The US has sanctioned Antal Rogan, a close ally of Hungarian Prime Minister Viktor Orban, for his alleged leading role in systemic public corruption in Hungary, outgoing US Ambassador David Pressman informed local media at an extraordinary press conference on January 7.

The US placed sanctions on Hungarian Prime Minister Viktor Orban’s influential cabinet chief for his alleged role in corruption, just days before Orban’s ally Donald Trump takes over in the White House.

On Tuesday, a top Hungarian government official and adviser to Prime Minister Viktor Orban was sanctioned for alleged corrupt activity by the United States, according to the U.S. Department of State.