Mitt Romney is ramping up attacks on President Obama over rising gasoline prices by calling for the firing of Obama’s Interior and Energy secretaries and the head of the Environmental Protection Agency.

The GOP presidential frontrunner dubbed them the “gas hike trio” on Fox News Sunday and at a campaign stop in Illinois Saturday night, signaling the extent to which Republicans hope to translate pump prices into a damaging political liability for Obama.

On Fox, Romney claimed that Obama’s stated desire for lower gas prices is an election-year turnabout. “The right course is they ought to be fired because the president has apparently suffered an election-year conversion,” Romney said, echoing a line of attack he unveiled the prior evening.