Senate Majority Leader Chuck Schumer has called on the Federal Trade Commission to “pump the breaks” on Chevron’s proposed $53 billion purchase of fellow oil company Hess.

“I’m sounding the alarm against yet another proposed Big Oil merger,” Schumer, D-New York, tweeted Sunday. “It would give Big Oil more fuel to raise gas prices. Trump might be hosting dinners for Big Oil execs, but the FTC should side with consumers and pump the breaks on this deal.”