Iran : This is after Iran says it needs more time to mull deal over nuclear production . Iran has revealed the existence of a second nuclear enrichment facility . Iran says its nuclear program is intended solely for peaceful purposes . Many in the West believe Iran is pursuing nuclear weapons capabilities .
NEW : Visit comes after Iran says it needs more time to mull deal over uranium production . Tehran has revealed the existence of a second nuclear enrichment facility . Iran says its nuclear program is intended solely for peaceful purposes . Many in the West believe Iran is pursuing nuclear weapons capabilities .