US may abandon automatic protections for Nato countries - Trump

Donald Trump suggested he would reassess US treaties with longstanding allies. (Getty)

Donald Trump has said that if he is elected president he may abandon a guarantee of protection to fellow Nato countries.

Speaking to the New York Times, Mr Trump said the US would only come to the aid of allies if they have "fulfilled their obligations to us".

Members of Nato have all signed a treaty that says they will come to the aid of any member that is attacked.

Mr Trump will speak on Thursday at the Republican National Convention.

In a preview of what he will tell convention-goers in his speech, he outlined a foreign policy strategy aimed at reducing US expenditure and involvement abroad.