Denis Menoud wrote on his Facebook page that following Iran's historic nuclear deal with the West, "the key thing is that Israel is on the
path to being incinerated."
His words caused an immediate outcry, with the Swiss Jewish rights group CICAD demanding the party "make a stand regarding this type of despicable
Menoud, who later deleted the post from the page, told the Swiss newspaper Tribune de Geneve his remarks had been taken out of context.
"The point was the agreement with Iran... Israel is the loser, strategically and politically, from this plan. Anything else is a toxic and abusive interpretation," he said.
The MCG is increasingly prolific in the Geneva canton, having won 20 of the 100 seats in the regional parliament in September on a platform of border security.
Menoud refused to resign at his party's request, but party president Roger Gelay said the lawmaker was "no longer considered a member."
Menoud is renowned for his verbal gaffes, including previous off-colour remarks about homosexuals and naturalised immigrants.