"This will only accelerate the collapse of the EU. Check if I'm right in four months," he wrote on X.
The comment comes as a response to a post in which British far-right activist Tommy Robinson wrote that Hungary has "fallen" due to the election results.
On Sunday evening, several European leaders congratulated Péter Magyar after his party Tiza's victory in the Hungarian election.
"A new chapter in Hungary's history," wrote Prime Minister Ulf Kristersson on X.
