President Donald Trump celebrated the far-right Alternative for Germany party Tuesday after it scored a landslide victory in a regional election, praising the party’s rise and tying its success to voter frustration over immigration.

“Wow! The Populist Party in Germany just had a really big night,” Trump said in a Truth Social post. “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!”