Donald Trump has said he would "encourage" Russia to attack any Nato member that fails to pay its bills as part of the Western military alliance.
Trump said he had once told a leader he would not protect a nation behind on its payments, and would "encourage" the aggressors to "do whatever the hell they want".
Members of Nato commit to defend any nation in the bloc that gets attacked.
The White House called the comments "appalling and unhinged".
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