By Andreas Rinke and Matthias Williams BERLIN (Reuters) -Election winner Friedrich Merz on Tuesday ruled out a quick reform to Germany's state borrowing limits known as the "debt brake" and said it was too soon to say whether the outgoing parliament could wave through a massive military spending boost.

The leader of the far-right Alternative for Germany (AfD), the second largest party in parliament after Sunday's election, said Germany's likely next chancellor would be held hostage by left-wing parties that would seek to loosen tough fiscal rules.

Provisional results confirmed that mainstream conservatives led by Friedrich Merz won Germany's national election​, while far-right party AfD surged to become the nation's second-largest.

The Christian Democrats won with 28.6% of the vote while the far-right Alternative for Germany came second with 20.8%.

Merz expressed concern over changing relations with Washington under the Trump administration, emphasizing the need for gradual independence from the U.S.