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WASHINGTON — A government watchdog agency has cleared Interior Secretary Ryan Zinke of wrongdoing following an inquiry into whether he redrew the boundaries of a national monument in Utah to avoid the nearby land holdings of a Republican state lawmaker and supporter of President Donald Trump.

The Interior Department’s inspector general, Mary Kendall, found “no evidence” that Mr. Zinke gave Utah State Representative Michael E. Noel preferential treatment when the agency last year shrank the size of Grand Staircase-Escalante National Monument in a way that excluded a parcel of land owned by Mr. Noel.

Investigators concluded there was also no evidence that Mr. Zinke or other Interior staff “were aware of Mr. Noel’s financial interest in the revised boundaries, or that they gave Noel any preferential treatment in the resulting proposed boundaries,” according to a November 21 letter Ms. Kendall wrote to David Bernhardt, the deputy secretary of the Interior.

Mr. Zinke is the chief architect of a number of President Trump’s environmental regulatory rollbacks. Several investigations into his behavior at the agency are still pending, and he also faces a possible Department of Justice inquiry into his involvement in a land deal in Whitefish, Mont., linked to the energy giant Halliburton.