As a member state of the IWC, the U.S. does not participate in commercial whaling, though it allows for some subsistence whaling by indigenous Alaskan communities. While Japan is also a member of the IWC, it conducts hunts under a loophole of the 1986 global moratorium on whaling that allows for "scientific research."
Last March, the International Court of Justice ruled that the country's Antarctic whaling program was "unscientific" and ordered it to halt.
The U.S. is likely not the only country that will voice opposition to the renewed hunt. IWC has 88 member countries - 49 of which outspokenly oppose whaling. Australia and New Zealand have voiced strong opposition to whaling in the past, and even brought the court case to the ICJ in an attempt to stop it. It remains to be seen how the international community will react to Japan's plans - but if history tells us anything, they won't be well-received.