BERLIN/FRANKFURT, Germany—Andrea Nahles said on June 2 she would resign as leader of Germany’s Social Democrats (SPD), raising new doubts about the durability of Chancellor Angela Merkel’s ruling coalition with the center-left party.
Merkel’s Christian Democrats and the SPD both bled support in last week’s European elections as voters turned away from mainstream political parties, undermining a ruling coalition that already came close to falling apart last year.
