Interior Secretary Ryan Zinke at his confirmation hearing last year. Congressional Democrats and a public watchdog group are calling for an ethics investigation into Zinke over a land deal between his family foundation and oil and gas company Halliburton.

Interior Secretary Ryan Zinke at his confirmation hearing last year. Congressional Democrats and a public watchdog group are calling for an ethics investigation into Zinke over a land deal between his family foundation and oil and gas company Halliburton.