While the 81-year-old Democrat quickly corrected himself, the gaffe has fueled speculation about his fitness for office ahead of the U.S. presidential election in November, with dozens of his own allies calling for Biden to step down in favor of a younger candidate. His rival, Republican challenger Donald Trump, has wasted no time mocking the error.

Meeting with Irish Prime Minister Simon Harris after landing in County Clare, Zelenskyy thanked Ireland “for hosting a lot of Ukrainian refugees — you were with us from the very beginning of the Russian invasion.”

According to…