With 10 months to go to the US presidential election and Trump on track to win the Republican nomination, his second term in office has become a real possibility. « You must understand that if Europe is attacked, we will never come to help and support you », Donald Trump told Ursula von der Leyen in 2020. As a reminder, the United States is the main donor of military and financial aid to Kyiv and remains the defence umbrella for Europe along with NATO. European officials also fear that Trump’s return to power could rekindle trade tensions between the EU and the US. Could America really leave NATO, as Donald Trump regularly threatens? How are Atlanticist states such as the Baltic States and those of Central Europe preparing for an eventuality without NATO for their security? What implications of a Trump comeback for the war in Ukraine, NATO, trade policy, as well as European politics and democracy ? To discuss this, we are delighted to welcome Laurent Cohen-Tanugi, an international lawyer and a member of the Board of Directors of the Jacques Delors Institute, as well as the author of numerous books on European and transatlantic affairs.