John Kerry actually said...

Most importantly, the President should renew his campaign position that all options will remain on the table.

I would suggest that as a country, in addition to trying to negotiate with the Government of Iran, we try to open up to the people of Iran.

If you don't want to leave us with just one option, a military option, you need to join us in much tougher sanctions than those that we have...

I do think it makes sense to keep the threat of force on the table.