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.

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.

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. Antal Rogán, a longtime ally of the Hungarian prime minister overseeing state-owned media and part of the intelligence services,

Antal Rogan is the first high-ranking Hungarian official sanctioned by the U.S. under the Magnitsky Act, which targets individuals involved in serious human rights abuses and corruption.

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,