In his latest spat with current premier Naftali Bennett, former Israeli Prime Minister Benjamin Netanyahu has attacked his rival’s approach to Iran and the Vienna nuclear talks.

“Iran is racing forward while Bennett remains silent and buckles before it, “Netanyahu wrote in a Hebrew tweet Thursday.“The Bennett government is dangerous for Israel.”

Bennett said on Tuesday that Israel would not automatically oppose any agreement reached between Iran and world powers in Vienna. “We are not automatic naysayers. We’re taking a practical approach… Unlike others, we’re not looking to fight for the sake of fighting; rather, we’re trying to bring a result.”

The commitment by the United States administration of President Joe Biden to work to revive the 2015 Iran nuclear deal wrong-footed Israel, which opposed the agreement and is widely held responsible for cyber and military attacks on Iran’s nuclear sites. Bennett, who replaced Netanyahu in June, has reportedly felt a cold shoulder from Biden.

In December Bennett urged world powers to take a far harder line against Tehran in Vienna, telling the Israeli cabinet that Iran “cannot enrich uranium and negotiate at the same time” and “must begin to pay a price for its violations.”