A nuclear deal is at hand if Washington makes up its mind, Iran's Foreign Ministry spokesman, Saeed Khatibzadeh, said in a tweet early on Tuesday.
Khatibzadeh added, "Iran is willing but will not wait forever".
(The story has been refiled to correct, in first paragraph, spokesman's first name to Saeed, not Said; in 2nd paragraph, fixes typo in spelling of last name)
(Reporting by Lilian Wagdy; Editing by Leslie Adler)
