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.

A senior Hungarian government official close to Prime Minister Viktor Orbán was hit Tuesday with U.S. sanctions for his alleged involvement in corruption in Hungary, a rare step against a sitting official in an allied country.

The US sanctioned a top Hungarian official and close ally of Prime Minister Victor Orban over corruption allegations

The US has placed Viktor Orbán’s chief of staff under sanctions for alleged corruption, the highest-ranking Hungarian official to be blacklisted since the fall of Communism.

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.

The United States announced sanctions against the head of Hungarian Prime Minister Viktor Orban's cabinet on Tuesday for his alleged involvement in corruption."This systemic corruption Antal Rogan represents is affecting Hungary's decision-making on issues that impact the security of the United States of America and our allies,

The U.S. administration announced on Tuesday that it would sanction Antal Rogan, the head of Hungarian Prime Minister Viktor Orban's cabinet, for corruption. According to the State Department, the case of the prime minister's close associate exemplifies "state capture by oligarchs and undemocratic actors.

The US Treasury Department has imposed sanctions on Antal Rogan, a senior Hungarian government official and one of Hungary’s Prime Minister Viktor Orbán's closest associates. Source: a statement by the US Treasury Department,