A British aide to Donald Trump has denied accusations that his ties to a Hungarian group linked to the Nazis are evidence of anti-Semitic views, as calls mount for his resignation.

Sebastian Gorka, who serves as deputy assistant to the president, is under increasing pressure after he was pictured wearing a medal presented by the Vitezi Rend.

The US government designated the order as an organisation “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 said he wore the medal in memory of his father, who was honoured for his fight against the Communist regime in Hungary.