Mr. Merz needed two rounds of voting to become chancellor after a surprising defeat in Parliament hours earlier that threatened to hobble his new government.

In a historic first, conservative leader Friedrich Merz ’s bid to become Germany’s 10th chancellor since World War II failed by six votes in parliament on Tuesday, a stunning defeat as he had been widely expected to win smoothly.

Conservative Friedrich Merz is set to be sworn in on Tuesday as Germany's new chancellor at a critical juncture as the economy battles its longest post-war downturn, relations with top security ally the United States fray and the far-right surges.