The Japanese government has begun analyzing the possible effects of a Donald Trump presidency in the United States.

Republican presidential nominee Trump has repeatedly stated he would take the U.S. out of the Trans-Pacific Partnership (TPP) free trade deal and re-evaluate the Japan-U.S. security treaty, raising the genuine possibility of a major shift in U.S. policy toward Japan should he become president.

"We will cooperate vigorously with the United States no matter who becomes president. Our stance has not changed on that front," Chief Cabinet Secretary Yoshihide Suga said during a July 20 news conference. However, should the U.S. leave the TPP or demand to renegotiate after spearheading the deal in the first place, it would be very difficult to reach a new agreement.

In an obvious reference to possible shifts in U.S. policy on the TPP, Suga told reporters on July 19, "The leaders of all 12 (TPP) nations, including the United States, have confirmed they will move to implement the pact in the near term." He also urged the administration of President Barack Obama to have the TPP approved quickly, saying, "It's important for each signatory nation to act responsibly and move forward with the necessary procedures in their own country."

Trump has also criticized the Japan-U.S. security treaty, stating that under the treaty Japan has no duty to protect the U.S. and that he would pull U.S. forces out of the country if Japan did not agree to pay a larger share of the cost for maintaining the U.S. military presence here. Suga has retorted that "the Japan-U.S. alliance structure is not designed to benefit just one side," but Japanese authorities have become wary of growing "America first" rhetoric.