BEIJING — Hillary Clinton privately said the U.S. would “ring China with missile defense” if the Chinese government failed to curb North Korea’s nuclear program, a potential hint at how the former secretary of state would act if elected president.

Clinton’s remarks were revealed by WikiLeaks in a hack of the Clinton campaign chairman’s personal account. The emails include a document excerpting Clinton’s private speech transcripts, which she has refused to release.

A section on China features several issues in which Clinton said she confronted the Chinese while leading the U.S. State Department.

China has harshly criticized the U.S. and South Korea’s planned deployment of a missile-defense system against North Korea, which conducted its fifth nuclear test this year. But Clinton said she told Chinese officials that the U.S. might deploy additional ships to the region to contain the North Korean missile threat.

If North Korea successfully obtains a ballistic missile, it could threaten not just American allies in the Pacific, “but they could actually reach Hawaii and the west coast theoretically,” Clinton said.

“We’re going to ring China with missile defense. We’re going to put more of our fleet in the area,” Clinton said in a 2013 speech.