Mr Rouhani also told US broadcaster NBC he had full authority to negotiate with the West over Tehran’s controversial uranium enrichment programme.
And he described a recent letter sent to him by US President Barack Obama as “positive and constructive”.
Earlier, Iran freed noted human rights lawyer Nasrin Sotoudeh and reportedly released 10 other political prisoners.
The 10 other detainees – seven women and three men – are said to include reformist politician Mohsen Aminzadeh.
Source: BBC News