LONDON (Reuters) -Global coffee prices plunged on Friday after U.S. President Donald Trump removed 40% tariffs on imports of Brazilian agricultural products including coffee and cocoa in the face of growing angst from American consumers about high food costs.

U.S. retail coffee prices rose an annual 40% in September, due in part to tariffs, and rising food prices are a major factor behind Trump’s approval ratings falling to their lowest since his return to power, a Reuters/Ipsos poll found.

Trump’s overnight tariff removal on Brazil follows a similar order announced last Friday to roll back duties on coffee and scores of other agricultural products from producing countries.

Top coffee grower Brazil supplies the U.S., the world’s largest coffee consumer, with about a third of its beans.

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