The United States is seeking to negotiate a treaty with Iran that will cover both its ballistic missile and nuclear programs, the U.S. special envoy for Iran said on Wednesday ahead of U.N. meetings in New York next week.

"The new deal that we hope to be able to sign with Iran, and it will not be a personal agreement between two governments like the last one, we seek a treaty," envoy Brian Hook told an audience at the Hudson Institute think tank.

But Hook said Iranian leaders have not been interested in talking despite statements by President Donald Trump and Secretary of State Mike Pompeo this year that the administration was willing to meet.