Previously undisclosed e-mail messages turned over to the F.B.I. and Senate ethics investigators provide new evidence about Senator John Ensign’s efforts to steer lobbying work to the embittered husband of his former mistress and could deepen his legal and political troubles.
Mr. Ensign, Republican of Nevada, suggested that a Las Vegas development firm hire the husband, Douglas Hampton, after it had sought the senator’s help on several energy projects in 2008, according to e-mail messages and interviews with company executives.
The messages are the first written records from Mr. Ensign documenting his efforts to find clients for Mr. Hampton, a top aide and close friend, after the senator had an affair with his wife, Cynthia Hampton.