Fidesz MEP Csaba Dömötör said initial experiences indicate that the new MEPs of the opposition Tisza Party "are carrying on where Momentum left off", referring to the small liberal opposition party that performed poorly in this year's European Parliament elections.
Dömötör said on Facebook that Tisza MEPs were now trying to meddle with Hungary's energy price subsidy system.
Tisza MEP Gabriella Gerzsenyi previously said that Hungary was harming itself with the scheme, Dömötör said, adding that a recent vote by Tisza MEPs against the scheme showed that they had now raised their objection to a higher level.
The European Parliament's Committee on Industry, Research and Energy (ITRE) has approved a resolution condemning extant energy price subsidy systems in certain member states, and Tisza MEPs voted in support, Dömötör said.
"To make things worse, not only have they voted in support of it but now they are trying to deny it," he said. "They shouldn't because it is all public," he added.