After long insisting that Canada could avoid Trump tariffs through talks, Mark Carney now says that is unlikely for any nation.

The letter reiterated Trump’s complaints about dairy quotas, fentanyl and the U.S. trade deficit, which is mostly fueled by American refineries’ thirst for Canadian oil. His social media post caused the Canadian dollar to immediately tumble, indicating the market wasn’t expecting this escalation.

The Canadian prime minister said it may not be possible to escape U.S. tariffs even with a bilateral agreement to resolve the current tariff row.