The chances of reviving the 2015 Iran nuclear deal are shaky at best and Washington is ready to tighten sanctions on Tehran and respond to "any Iranian escalation" with Israel and others if the pact cannot be saved, a senior US official said on Wednesday.
"We do not have a deal ... and prospects for reaching one are, at best, tenuous," US Special Envoy for Iran Rob Malley told the Senate Foreign Relations Committee, alluding to indirect US-Iran talks in Vienna that unraveled in March.
