The US Treasury has imposed sanctions on Antal Rogan, one of the most powerful men in Hungarian Prime Minister Viktor Orban's Fidesz government and the minister in charge of his cabinet office. It is a rare move between Nato allies,

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 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.