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%.

Tariff revenues have brought in more that $113 billion so far this year, according to the Treasury Department data. The U.S. received more than $27 billion in customs duties in June alone.