How America's allies are trying to 'Trump-proof' Nato's future
The prospect of a second term for Donald Trump has loomed over the Nato summit in Washington.
Only one US president has been at the Nato summit in Washington this week, but the shadow of another - his predecessor - has loomed over this meeting of the world's most powerful military alliance.
While the host Joe Biden has presided over a message of unity from the group's 32 members, the Nato-sceptic views of his rival for power, Donald Trump, have imbued conversations here with an urgency and an anxiety.