Karen Budd-Falen, the No. 3 at the Interior Department, didn’t disclose a $3.5 million water-rights contract between her husband and the developers of a Nevada mine, records show.

© Rick Bowmer/Associated Press

Harold Hamm, an Oklahoma oil tycoon, has played a central role in reshaping energy policy by allying himself with President Trump.

© Loren Elliott for The New York Times