(Reuters) - Goods imported from both the European Union and Mexico will face a 30% U.S. tariff rate starting August 1, U.S. President Donald Trump said in letters posted to his social media platform on Saturday.

Following are reactions to the announcement:

URSULA VON DER LEYEN, PRESIDENT OF THE EUROPEAN COMMISSION

"Imposing 30 percent tariffs on EU exports would disrupt essential transatlantic supply chains, to the detriment of businesses, consumers and patients on both sides of the Atlantic.

"The EU has consistently prioritized a negotiated solution with the U.S., reflecting our commitment to dialogue, stability, and a constructive transatlantic partnership.

"We remain ready to continue working towards an agreement by August 1. At the same time, we will take all necessary steps to safeguard EU interests, including the adoption of proportionate countermeasures if required."

DAN O'BRIEN, CHIEF ECONOMIST, INSTITUTE OF INTERNATIONAL AND EUROPEAN AFFAIRS, IN POST ON X

"A 30% tariff on EU goods going to US would have a significant trade destruction effect. The threat to meet any EU tariff retaliation with a further and equal percentage point increase in the US tariff highly provocative. Chances of wider EU-US economic conflict have risen."

(Compiled by EMEA Editing Desk)