Berlin, Germany - German Chancellor Friedrich Merz canceled a planned phone call with President Donald Trump on Wednesday, mere hours after the US leader celebrated the country's first far-right victory since WWII.

A spokesman for Merz declined to give a reason for the cancellation of the planned phone call, but confirmed to journalists it was not due to scheduling conflicts.

"Wow! The Populist Party in Germany just had a really big night," Trump had written on Truth Social on Tuesday night, referring to the recent shock election of an extreme-right government in the German state of Saxony-Anhalt on Sunday.

"They finally got tired of the absolutely horrible Immigration rules and regulations which have hurt Germany so badly. THEY ARE ON THE RISE, and not going to take it anymore!"

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He then exclaimed "MGGA," which is likely to be an acronym for "Make Germany Great Again" in reference to Trump's famous electoral slogan.

Merz's spokesman did not directly respond to Trump's comments, but noted that the chancellor had frequently objected "in general terms" to "interfering in or commenting on the domestic political situation, particularly regarding elections."

A new date for a phone call between the two leaders had not yet been set, the spokesman added.

The Alternative for Germany (AfD) – which Merz has repeatedly attacked as racist and a threat to democracy – scored a breakthrough win on Sunday in a regional election, securing more than 40% of the vote and sending them into government.

Other figures in Trump's political orbit, including billionaire Elon Musk – who famously gave a Nazi salute during the president's inauguration last year – have also publicly celebrated the AfD's victory.

The AfD's ascension in Saxony-Anhalt will be the first time that a far-right party, classified as an extremist group by German intelligence, has risen to power in Germany since 1945.