Donald Trump, who is now expected to be the Republican candidate for U.S. president, has made a number of disturbing remarks.
Particularly troubling to Japanese officials is his threat to shake up the Japan-U.S. military alliance.
Trump has argued Japan should pay all the costs of stationing U.S. forces in the country, saying he would otherwise consider withdrawing the U.S. military and allowing Japan to arm itself with nuclear weapons.
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