A British aide to US president Donald Trump will be leaving the White House months after he was pictured wearing a medal presented by an order that was "under Nazi control" during the Second World War, according to reports.

A senior administration official said Sebastian Gorka, a former counter terrorism analyst for Fox News who joined the administration as a counter terrorism adviser, will be leaving the White House in the coming days, the Associated Press and CNN reported.

In March, calls mounted for Mr Gorka's resignation after he was pictured wearing the medal, which was presented by the Vitezi Rend, an order designated by the US government as “under Nazi control” during the Second World War when Hungary’s nationalist leader Miklos Horthy allied with Adolf Hitler and collaborated in the murder of hundreds of thousands of Jews.

Mr Gorka denied accusations that his ties to a Hungarian group linked to the Nazis are evidence of anti-Semitic views.

The official said that Mr Gorka, who serves as deputy assistant to the president, had initially been hired to play a key role on the Strategic Initiatives Group, an advisory panel created by Mr Trump's chief strategist Steve Bannon to run parallel to the National Security Council.

But that group fizzled out in the early months of the administration. Mr Gorka was unable to get clearance for the National Security Council after he was charged last year with carrying a weapon at Ronald Reagan Washington National Airport.