Canada is preparing a list of potential US retaliatory tariffs and some of those could be on critical minerals, Energy and Natural Resources Minister Jonathan Wilkinson said on Thursday.

The government is preparing for the possibility that the incoming U.S. administration will impose high tariffs on Canadian goods, setting the close allies up for a showdown.

Canada’s ambassador to Washington said Monday that Canada is prepared to buy more from the United States, in response to President-elect Donald Trump’s concerns about the US-Canada trade deficit.