Mr Sales expressed his gratitude to Britain for last month classifying the whole group, including its political arm, a terrorist organisation and urged other European countries to do the same.
“Hezbollah is one organisation. Its leaders, its members, do not differentiate between their military terroristic activities on the one hand and their so-called political activities on the other,” he said.
Mr Sales also hinted at other measures European nations could take to increase the pressure on Iran, noting the fallout from a 1992 bombing of a Berlin restaurant.
European countries expelled Iran ambassadors, recalled their own ambassadors from Iran and suspended dialogue with the regime after that attack. The result, Mr Sales said, was more than two decades of “calm and security” in terms of Iran attacks in Europe.
He added: “What we need now is the same sort of robust, assertive response to signal to Tehran this is unacceptable and if you do it, we’re going to make you pay a price.”
Mr Sales acknowledged that unlike the US, EU countries remain committed to the Iran nuclear deal, but indicated they could still irregardless take steps to punish the regime over the terror plots.
On a separate issue – what should happen to Isil foreign fighters captured in Syria – Mr Sales, who is involved in the talks, also delivered a firm line from America.