"We should work on a vision of one day establishing a real European army", Merkel said during an address to MEPs at the European Parliament in Strasbourg on Monday. "This means that we should take the Europeans, our fate is more in the Hand if we want to survive as a European community".
"We will not protect the Europeans unless we decide to have a true European army", Macron said, according to The Wall Street Journal.
Trump also seemed to suggest that the notion of a European army and the North Atlantic Treaty Organisation alliance may be mutually exclusive.
Trump called the remarks "very insulting" in a Friday tweet sent out as he arrived in Paris for the centenarian celebration of the end of World War I.
European Commission President Jean-Claude Juncker shared the opinion of Mrs Merkel.
Brnabic's encounter with Merkel comes only days after Serbian President Aleksandar Vucic met the German chancellor on November 11 in Paris, where the two officials were attending ceremonies to commemorate Armistice Day. While addressing the media, Macron once again called for the establishment of a "true European army" that would defend the continent without American support.
Mr. Trump also used social media to deride Mr. Macron's leadership in France since winning the presidency last May, and the country's history during World War I and World War II. She then turned to Merkel and asked, "You are Madame Macron".
Traditionally, Dr Merkel has sought to avoid such controversial statements; unlike the French, the Germans were always much more apprehensive about the prospects of endangering the United States security guarantee which allowed Germany to prosper during the Cold War.
She reiterated German proposals to abandon unanimous voting in that joint foreign policy and for a small European "security council" to make decisions in a crisis - two ideas Macron only reluctantly agreed to in last summer's Franco-German declaration on Europe.
"The idea of the European army is a complete fiction; there's never been a European army and there can not be a European army", he said. Also Merkel did not comment in any more detail. A former "voice of German industry", Mr Henkel believes Mrs Merkel has dealt her country a "painful blow" by not doing more to keep ensure Britain remained an European Union member.