The US ambassador to Estonia is resigning, reportedly in frustration at remarks made by President Donald Trump about America's European allies.

James D Melville said Mr Trump's comments on Nato and the EU had brought forward his decision to retire, Foreign Policy magazine reports.

The magazine was quoting from a private Facebook post by the envoy.

Mr Trump accuses Europeans of unfairly expecting America to shoulder the costs of the Nato alliance.

He has also imposed trade tariffs on some EU industries.

In the private Facebook post seen by Foreign Policy, Mr Melville reportedly told friends: "For the president to say the EU was 'set up to take advantage of the United States, to attack our piggy bank', or that 'Nato is as bad as Nafta [the North American Free Trade Agreement]' is not only factually wrong, but proves to me that it's time to go."

Mr Melville is a career diplomat and took up his position as ambassador in Estonia in 2015 after being nominated by then President Barack Obama.

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