German Foreign Minister Sigmar Gabriel has become the most prominent foreign leader to criticise Ivanka Trump’s role in her father's administration, culminating in her visit to Berlin as part of the W20 summit on women’s empowerment.

Speaking to the German media group Funke, Mr Gabriel described Ivanka’s advisory role to President Donald Trump, her father, as “nepotism”, The Local reports.

He said: "For me there are things that remain strange, like for example the visit of his daughter to Germany which was treated almost like a world event, while the mix of politics with family and business reminds us instead of nepotism and would be unimaginable here."

This isn't the first time Ms Trump has faced accusations of nepotism. In March, Norman Eisen, the chief ethics counsel for Barack Obama, told CNN that her appointment as adviser to the President was a “violation” of nepotism laws. This “generally prohibits a federal official, including a Member of Congress, from appointing, promoting, or recommending for appointment or promotion any ‘relative’ of the official to any agency or department over which the official exercises authority or control”.

Jason Miller, the chief spokesperson for Mr Trump's presidential campaign, previously defended Ms Trump by saying that it isn't nepotism because her role is on a voluntary, non-paid basis.