US presidential hopeful Donald Trump has vowed to pursue an "America First" foreign policy, saying many nations, including allies, "ripped off" the US.
The frontrunner for the Republican nomination for the November election was speaking to the New York Times.
Mr Trump said he would consider pulling out troops from Japan and South Korea if they did not pay the US more.
He said he might stop buying oil from Saudi Arabia if it did not send troops to fight so-called Islamic State.
Mr Trump insisted he was "not isolationist" but "America First".
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