United States Trade Representative Jamieson Greer said exemptions to President Donald Trump’s global tariffs are not expected in the near term. “The president has been clear, again, that he’s not doing exemptions or exceptions in the near term,” Greer told the U.S. Senate Finance Committee on Tuesday.

Greer said that “Swiss cheese” in the process would undermine the goal of trade reciprocity.

The trade representative, who oversees the implementation of the tariffs, also said there is no particular timeline for trade negotiations.