Why is Donald Trump so hostile to Nato and are his claims justified?

US president Donald Trump attends a meeting ahead of a Nato summit at the US embassy in Brussels, Belgium, on 11 July 2018: Stephanie Lecoq/EPA
US president Donald Trump attends a meeting ahead of a Nato summit at the US embassy in Brussels, Belgium, on 11 July 2018: Stephanie Lecoq/EPA

Donald Trump is currently in Brussels for a two-day Nato summit with world leaders and secretary general Jens Stoltenberg, having been highly critical of the 28-member military alliance in recent years.

The US first joined the collective under President Harry Truman in 1949 but the current occupant of the White House argues it has been “obsolete” since the close of the Cold War.

In particular, President Trump insists Nato represents a “bad deal” for America because the majority of its states are failing to honour their financial commitments to its defence budget, leaving Washington to cover the tab for protecting Europe and Canada.

But how much truth is there behind the bluster?