The Israeli-Palestinian peace plan being prepared by U.S. President Donald Trump is "a waste of time," Justice Minister Ayelet Shaked said on Wednesday.

Speaking before hundreds of ambassadors and attaches at the Jerusalem Post Diplomats' Conference in Jerusalem, Shaked added that the differences between Israelis and Palestinians are too great.

"I want peace like everyone else," she said, "but I don't believe an agreement can be reached. I would tell Trump: 'Don't waste your time."

Shaked also spoke about the demand made by her party, Habayit Hayehudi, to appoint party leader Naftali Bennett as defense minister – an ultimatum that threatened the stability of Prime Minister Benjamin Netanyahu's government. 

"The prime minister needs a strong defense minister at his side," she said. "Unfortunately, he thought otherwise. We are a strong country and Hamas is just a terror organization. But in recent years we've lost our deterrence."

On Gaza, Shaked predicted the cease-fire will only last a few months, and then, "there will be no choice but to fight Hamas with all means."

Earlier at the conference, Strategic Affair minister Gilad Erdan said Israel is "closer than ever" to controlling parts or all of Gaza.

Erdan said that "moving from defense to offense against Hamas means targeted assassinations of terror leaders in Hamas' military wing."

This, Erdan said, "means being ready to take control of the Gaza Strip and hold it until we dismantle the terrorist infrastructure, Today we are closer than ever – since the devastating disengagement plan – to having to control parts of the Strip, or all of it."