But Hildebrand, a major Trump donor whose wife had been named ambassador to Costa Rica, had already seen how loyalty could be rewarded. Even though he had no notable operations outside the U.S., he hunched toward a microphone and said in a halting voice, “Hilcorp is fully committed and ready to go to rebuilding the infrastructure in Venezuela.”

“That’s good,” Trump said. “You’ll be very happy.”

As the founder and owner of Hilcorp, a privately held company known for buying up old, low-producing “stripper wells,” Hildebrand needs Trump’s favor. Long one of the oil industry’s top polluters, Hilcorp releases unusually large quantities of methane, a greenhouse gas that can trap 80 times more heat than carbon dioxide.