Donald Trump should not get involved in European democracy, European Commission President Ursula von der Leyen said Thursday, days after the US president launched a stinging attack on Europe, Politico reports.

“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 told Politico.

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

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

The US president denounced Europe as a “decaying” group of nations led by “weak” people, in an interview with Politico.

“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.”