BRUSSELS — Donald Trump should not get involved in European democracy, Ursula von der Leyen said Thursday, days after the U.S. president launched a stinging attack on Europe.

“It is not on us, when it comes to elections, to decide who the leader of the country will be, but on the people of this country … That’s the sovereignty of the voters, and this must be protected,” the European Commission president said in an interview at the POLITICO 28 gala event in Brussels.

“Nobody else is supposed to interfere, without any question,” the Commission chief added in response to a question about the U.S. National Security Strategy, which was published last week and caused uproar in Europe.

The strategy claims Europe is facing “civilizational erasure” within the next 20 years, a narrative that has resonated well with Europe’s far-right leaders, including Hungarian Prime Minister Viktor Orbán, as well as in Russia. The document also bashes European efforts to rein in far-right parties, calling such moves political censorship, and speaks of “cultivating resistance to Europe’s current trajectory within European nations.”

Von der Leyen said this is one of the reasons why the EU proposed the Democracy Shield, meant to step up the fight against foreign interference online, including in elections.

The Commission chief said she has always had “a very good working relationship” with U.S. presidents, and ” this is also the case today.” However, she stressed that Europe should focus on itself rather than making comparisons with others.

“From the bottom of my heart, I’m a convinced transatlanticist. But what is so important? [What’s] important is that … we take pride in being the European Union, that we look at our strength and that we deal with the challenges that we do have,” she said.

“Ofa course, our relationship to the United States has changed. Why? Because we are changing. And this is so important that we keep in mind: what is our position? What is our strength? Let’s work on these. Let’s take pride in that. Let’s stand up for a unified Europe. This is our task … [to] look at ourselves and be proud of ourselves,” von der Leyen said, to applause from the crowd.

The U.S. president denounced Europe as a “decaying” group of nations led by “weak” people in an interview with POLITICO’s Dasha Burns that aired Tuesday in a special episode of The Conversation podcast.

“I think they’re weak,” Trump said, referring to the continent’s presidents and prime ministers, adding, “I think they don’t know what to do. Europe doesn’t know what to do.” 

POLITICO on Thursday named Trump the most powerful person shaping European politics, placing him at the top of the annual P28 list.

The list highlights who is expected to have the most sway over Europe’s political direction in the coming year, based on input from POLITICO’s newsroom and the power players POLITICO’s journalists speak with.