"We've made it clear to the Bulgarians that…if they continue to endanger Hungary's secure supply of energy, then we will veto their Schengen membership," Szijjártó said.
"As that decision will be taken in the coming week, they're suddenly trying to repeal that law. If they really do repeal the law, then we will naturally take back our decision on the related veto," he added.
Hungary has argued that the higher transit fee Bulgaria has levied on its gas from Russia is tantamount to a customs tariff, prohibited on the EU's common market.