White House spokeswoman Sarah Sanders said Wednesday that Turkey’s decision to impose retaliatory tariffs against $1 billion worth of U.S. exports was “regrettable,” and hinted that its action could be met with a U.S. response, although she declined to say what that might be.

“The tariffs from Turkey are certainly regrettable and a step in the wrong direction,” Sanders said at the White House. “The tariffs that the United States placed on Turkey were out of national security interests, theirs are out of retaliation.”