The former foreign secretary David Cameron revealed he had been planning to impose sanctions on two extremist members of the Israeli government over their support for violent settlers and calls to block aid entering Gaza.

In a BBC interview Cameron said he was concerned the measure had not been adopted by the Labour government and had only held back from taking the step in the spring because he received advice it would be too political a step to take during the general election.

His first remarks on the Middle East since leaving the Foreign Office are likely to put pressure on the foreign secretary, David Lammy, to explain if he dropped a worked-up plan and why.

The sanctions – an asset freeze and travel ban – were due to be imposed on Israel’s finance minister, Bezalel Smotrich, and the national security minister, Itamar Ben-Gvir.

Cameron told BBC Radio 4’s Today programme: “Smotrich and Gvir had said things like encouraging people to stop aid convoys getting into Gaza and encouraging extreme settlers in the West Bank with the appalling things they have been carrying out.”

He said it was necessary to tell the Israeli prime minister, Benjamin Netanyahu, “when ministers in your government who are extremists and behave in this way we are prepared to use our sanctions regime to say this is simply not good enough and simply has to stop”.

Cameron criticised the Labour government’s partial ban on arms sales as a mistake, arguing “it made no sense” at a time when Israel needed to protect itself from state-on-state attacks from Iran.

He said: “There were other things we could do to put pressure on Netanyahu and say of course we respect your right to self-defence but we do want you to act within the law.”

In December last year Cameron announced on social media that a travel ban was being imposed against a small group of illegal settlers, saying: “We are banning those responsible for settler violence from entering the UK to make sure our country cannot be a home for people who commit these intimidating acts.”

Some reported this covered Smotrich and Gvir, but four others were named as being sanctioned.

In his BBC interview Cameron continued to defend the thrust of Israel’s policy to eradicate the threat posed by Hamas and Hezbollah.

He said “On October 7 Israel was not just attacked in the south by Hamas but then continually with rockets by Hezbollah in the north. We all want this conflict to end but it has to end in a way that is sustainable so that it does not restart. That is why it is right to back Israel’s right of self-defence. But it is not a blank cheque, it’s not unconditional. We do want to see aid get through to Gaza and we do want the role of the UN in Lebanon to be respected.”

At the Labour party annual conference at a fringe meeting, Lammy hinted at new sanctions against violent settlers, saying the issue was being considered by the G7.