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Xavier Bettel appeared to whisper to the French President Emmanuel Macron as the US leader berated fellow member states for failing to contribute.

The pair are seen looking at each other during the uncomfortable speech, with Mr Bettel covering his mouth during the address.

President Trump used his speech outside the new Nato headquarters to pressure "23 of the 28 member nations" who are failing to meet the commitment to spend two per cent of GDP on defence.

Last November, it was reported only the United States, Greece, United Kingdom, Estonia and Poland had fulfilled the budget pledge.