Following talks with Nato boss Jens Stoltenberg at the White House, the US President again called on alliance members to spend 2% of their GDP on defence.

"If other countries pay their fair share rather than relying on the United States to make up the difference, we will all be much more secure," Mr Trump told reporters.

He said: "The secretary general and I had a productive discussion about what more Nato can do in the fight against terrorism.

"I complained about that a longer time ago and they made a change and now they do fight terrorism.

"I said it was obsolete, it's no longer obsolete."

This is a developing story...