In the wake of new tariffs, the San Diego Regional Chamber of Commerce announced Monday that its senior leadership met with U.S. Ambassador to Mexico Ronald Johnson and emphasized the importance of a stable trade relationship between Mexico and the United States.

The Mexican delegation in Washington expressed disagreement with the tariff announcement and considered it “unfair treatment,” according to a government statement.

The tariffs are likely to inflame tensions with one of the largest U.S. trading partners.

While Mexico was spared from Trump's so-called "Liberation Day" tariff rollout on April 2, the 30% rate for the E.U. is 10 percentage points higher than what the president said he would apply to America's largest trading partner in April but lower than his mid-May threat of 50%.

President Donald Trump said he will impose a 30% tariff on Mexico due to his accusations of fentanyl coming across the border. The EU will also face a new tariff.

U.S. President Donald Trump's announcement of a proposed 50% tariff on copper imports has raised concerns in Chile and Peru, which together account for nearly 40% of global copper production.

Trump and his aides have repeatedly shifted their stance on tariffs since the president’s “Liberation Day” announcement.