"Blair should resign if no weapons are found"

Sir Joseph Rotblatt is a British nuclear scientist born in Poland. He received the Peace Prize in 1995 for his work in trying to reduce the role of nuclear weapons in international relations.

I am particularly concerned by the war in Iraq.

I believe that this war was unjustified. Several reasons were given why America and Britain should start this war. One of course was that we had to fight an obnoxious regime.

None of us likes this regime, but the overturn of a bad regime is not a legal reason for starting war.

The present charter of the United Nations recognises the sovereignty of individual states, and therefore whatever that state does within it, however it murders its own people, legally other nations cannot start war - otherwise there will be anarchy.

This brings me to the other reason why we started this war - the apparent possession by Iraq of weapons of mass destruction, including nuclear weapons.

Sir Joseph Rotblatt has been a long-time campaigner against nuclear weapons

Bush is very much afraid of Saddam Hussein - he doesn't like his having nuclear weapons.

But he himself relies on nuclear weapons for his power, and I feel this is against international commitments.

The non-proliferation treaty has been signed and ratified by the United States - it is committed legally to get rid of its nuclear weapons - yet its policies go quite against this.

If anybody is to be indicted under international law, it should be President Bush and his policies.

I believe that should it be found in further military action in Iraq that Iraq did have nuclear weapons and would have used them, then the stand taken by Britain and America would have proved to be valid.

Even so, without a definite resolution it would not be quite lawful.

On the other hand, if no useable chemical, biological and nuclear weapons are found at all, then I think the arguments used by the prime minister, justifying the war in his speech to the House of Commons, will be proved to be false.

In my opinion, even though the war will be won, he should still have to resign.