Yes, the US will still talk to Iran if Iran wants to talk. No, the US won't start a war with Iran. The US will pursue what the US feels are appropriate sanctions. The Russians and Chinese probably won't go along. Israel will be free to try a naval blockade of Iran since they think that is a sanction against others and only an act of war when against Israel. It is doubtful anybody will assist Israel in the naval blockade. Iran is digging mine-shafts. Israel should be digging them too and stocking them with the people Israel has determined it needs there. (See Dr Strangelove for appropriate criteria.) The mine-shaft gap is growing! The US has extended its nuclear umbrella over Israel and no country protected by that has ever been attacked with nukes.
U.S. Senate votes overwhelmingly for tougher North Korea sanctions (Reuters)
from the article: Obama to Iran: Offer of dialogue still stands