President of the European Commission, Ursula Von der Leyen, left, French president Emmanuel Macron, right, and European Parliament President Roberta Metsola, May 9, 2022.

Video. Explained: Why EU countries are at odds over treaty changes

Supporters of treaty changes say that it will make the EU quicker to respond to crises like COVID-19 and the war in Ukraine but opponents say it will take too much political energy that's currently needed elsewhere.