President Donald Trump posted letters to the leaders of Mexico and the European Union, saying they had not done enough to head off the new tariffs.

The 1996 agreement is set to expire Monday, which could raise the price of Mexican tomatoes and threaten thousands of Texas jobs.

If implemented, Trump's new 35 percent duties will be "separate from all Sectoral Tariffs," such as the 50 percent tariff on steel and aluminum imports. Trump also promised that, if Canada raises its own tariffs in response, then "whatever number [Canada chooses] to raise them by, will be added onto the 35% that [the U.S. charges]."

President-Musk shutdown scandal keeps escalating. Meanwhile, President’s tariff moves toward Mexico and Canada just got paused.

The pause on the biggest of Trump's tariffs won't end this week, but the president continues to pledge steep new duties against major countries.

Global investors got a harsh reminder of the risks around trade tariffs and U.S. President Donald Trump's deal-making on Saturday after he threatened fresh tariffs on his biggest trading partners in Europe and Mexico.

Trump has sent letters to 22 countries warning of incoming tariff rates, according to his social media posts, including 50 percent taxes on Brazilian imports and 35 percent on Canadian goods. The letters follow the administration’s insistence that the president was making “90 deals in 90 days” beginning in April.