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.