US & Iran: From enemies to 'rivals'?

"... Further impediments could stem from U.S. regional allies who oppose a thaw in U.S.-Iranian relations. However, contrary to what some in Israel and Saudi Arabia believe, a collaborative U.S.-Iranian relationship on common-cause issues does not have to be at their expense. Tehran has no interest in a patron-client relationship, as NIAC’s Research Director Reza Marashi puts it, and is interested in a competitive yet cooperative relationship with Washington akin to Russian and Chinese relations with the United States. The United States understands this and is testing to see if both countries can go from being “enemies” to being “rivals”..."