One of Trump’s Biggest Oil Donors Vows to Only Buy US-Made Gear

Harold Hamm, a shale billionaire and significant donor to President Donald Trump, said his company Continental Resources is committing to only buy oilfield equipment made in the US — even if it costs more.

Hamm, a geologist who invented sideways drilling in oilfields, said he studied how tariffs would impact his business and was surprised to learn how much of his equipment was made internationally.

“We came to the conclusion that this was not right,” Hamm said in a Bloomberg Television interview, “We’re going to have a preference to buy American again. We always had that — but ...