Brazilian President Lula da Silva vowed to trigger Brazil's reciprocity law if negotiations with the U.S. fail.

The proposal is a blow to U.S. meat companies also facing tighter cattle supplies due to a halt of livestock imports from Mexico over New World screwworm, a flesh-eating pest spreading south of the border.

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.