Mr Tusk said: "Besides traditional political challenges, such as the rise of China or the aggressive stance of Russian Federation, we are witnessing today a new phenomenon: the capricious assertiveness of the American administration".
"Looking at latest decisions of [Trump] someone could even think: with friends like that who needs enemies", wrote Donald Tusk, president of the European Council.
Trade tensions have been growing since March 23, when Donald Trump ordered to introduce a 25% tariff on steel imports and 10% tax on aluminum, claiming to protect the United States producers from unfair competition and boost national security.
"I want the European Commission to be given a green light, so that it is ready to act whenever European interests are affected", he said.
Senate To Vote On Net Neutrality Today
If You'd Like to Call Congress to Make Your Voice Heard on Net Neutrality, You Can Use This Tool Created by the ACLU. Sherrod Brown says this week's vote could help sway more Republicans if it heads to the House.
European leaders are troubled by Trump's "America first" rhetoric and inconsistent statements on North Atlantic Treaty Organisation and the European Union.
"Here again, unity is our greatest strength and my objective is simple - we stick to our guns". Later, Washington extended the exemptions for the European Union, Canada and Mexico for 30 days in order to make time for talks on the terms of steel and aluminum imports.
"The EU and U.S. are friends and partners, therefore USA tariffs can not be justified on the basis of national security", he said. It is absurd to even think that Europe could be a threat to the United States.
Tusk, a former prime minister of Poland who now presides over one branch of European Union policymaking, went full zen in his angry description of Trump's effect on Europe.
Mr. Tusk called on the European leaders of the countries that signed the agreement - like Prime Minister Theresa May of Britain, Ms. Merkel and President Emmanuel Macron of France, who tried but failed to talk Mr. Trump into not scrapping the deal - to reconfirm their commitment to the accord. "We need to bring back reality in this discussion, which is not the case today".
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Adeyeye added, "We must remind ourselves that as we speak right now, many health workers in our country are on strike. It involves vaccinating voluntary contacts, contacts of those contacts and health care and other front-line workers.
While European officials have spoken out against Trump's trade actions before, the language used by Tusk marks a new tone in the relationship.
Tusk spoke about the Iran nuclear deal in further detail while also outlining a few other issues he had with the current leader of the United States in his prepared remarks.
He added: "Besides traditional political challenges such as the rise of China, or the aggressive stance of Russian Federation, we are witnessing today a new phenomenon: the capricious assertiveness of the American administration".
Speaking to reporters in Sofia, Mr Tusk said the US President had "made us realise that if you need a helping hand, you all find one at the end of your arm".
"I have no doubt that in the new global game", Tusk said, "Europe will either be one of the major players or will be a pawn".
Powerful storms kill two people in Northeast
More rain is expected over the next few days, with potential flooding through Saturday. A third person was killed by a falling tree in New Fairfield, Connecticut.