Chairman of the Germany's Social Democratic Party (SPD) in North-Rhine Westfalia and and deputy federal chair of the SPD Achim Post delivers a speech during a May Day rally with the motto "together for good work" of trade union IGBCE (IG Mining, Chemistry, Energy) in Bergkamen, on May 1, 2026. (Photo by INA FASSBENDER / AFP via Getty Images)

Chairman of the Germany's Social Democratic Party (SPD) and Vice-Chancellor Lars Klingbeil delivers a speech during a May Day rally with the motto "together for good work" of trade union IGBCE (IG Mining, Chemistry, Energy) in Bergkamen, on May 1, 2026. (Photo by INA FASSBENDER / AFP via Getty Images)

Chairman of the Germany's Social Democratic Party (SPD) in North-Rhine Westfalia and and deputy federal chair of the SPD Achim Post delivers a speech during a May Day rally with the motto "together for good work" of trade union IGBCE (IG Mining, Chemistry, Energy) in Bergkamen, on May 1, 2026. (Photo by INA FASSBENDER / AFP via Getty Images)

Place publique's centre-left party leader and France's MEP Raphael Glucksmann (L) and Mayor of Rouen Nicolas Mayer-Rossignol march as they take part in a May Day (Labour Day) rally, marking International Workers' Day, in Rouen, northern France on May 1, 2026. (Photo by Lou BENOIST / AFP via Getty Images)

Chairman of the Germany's Social Democratic Party (SPD) and Vice-Chancellor Lars Klingbeil delivers a speech during a May Day rally with the motto "together for good work" of trade union IGBCE (IG Mining, Chemistry, Energy) in Bergkamen, on May 1, 2026. (Photo by INA FASSBENDER / AFP via Getty Images)

Chairman of the Germany's Social Democratic Party (SPD) and Vice-Chancellor Lars Klingbeil delivers a speech during a May Day rally with the motto "together for good work" of trade union IGBCE (IG Mining, Chemistry, Energy) in Bergkamen, on May 1, 2026. (Photo by INA FASSBENDER / AFP via Getty Images)

A choir of former miners (Ruhrkohlechor) listen as the Chairman of the Germany's Social Democratic Party (SPD) and Vice-Chancellor delivers a speech during a May Day rally with the motto "together for good work" of trade union IGBCE (IG Mining, Chemistry, Energy) in Bergkamen, on May 1, 2026. (Photo by INA FASSBENDER / AFP via Getty Images)

Chairman of the Germany's Social Democratic Party (SPD) and Vice-Chancellor Lars Klingbeil delivers a speech during a May Day rally with the motto "together for good work" of trade union IGBCE (IG Mining, Chemistry, Energy) in Bergkamen, on May 1, 2026. (Photo by INA FASSBENDER / AFP via Getty Images)