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Donald Trump has refused to rule out using nuclear weapons against ISIS following the terror attack in Brussels that claimed 34 lives.

Defending the comments in an interview with Bloomberg, Trump said he didn't want to talk at length because 'the enemy is watching', adding 'at a minimum, I want them to think maybe we would.'

The remark is likely to provide fuel to Clinton's campaign as she has referred to the need for 'steady hands' in combating terrorism - implying that The Donald cannot be trusted with weapons such as America's nuclear arsenal.

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Donald Trump has refused to rule out the use of nuclear weapons against ISIS, saying he won't discuss tactics because 'the enemy is watching', saying that 'we need unpredictability' in the fight against terror (file image)

Discussing relations with the Muslim world as a whole, Trump said the most important thing is getting Islam to 'respect the West and respect [America]' (file image)

Trump said: 'I'm never going to rule anything out - I wouldn't want to say. Even if I wasn't, I wouldn't want to tell you that because at a minimum, I want them to think maybe we would use them.

'We need unpredictability. We don't know who these people are. The fact is, we need unpredictability and when you ask a question like that, it's a very sad thing to have to answer it.

'The enemy is watching and I have a very good chance of winning and I frankly don't want the enemy to know how I'm thinking. But with that being said, I don't rule out anything.'

Referring to Muslims in general, Trump added that 'they do not respect us' and said that part of winning the fight against extremism is to 'get them to respect the West and respect us.'

Part of that agenda, according to Trump, involves bringing back so-called enhanced interrogation techniques such as waterboarding, and potentially changing the law to allow torture.

Trump has also spoken of 'going after the families' of terrorists fighters, bemoaning international treaties that prevent U.S. troops from using similar tactics to ISIS troops on the battlefield.

Other measures designed to earn the 'respect' of the Muslim world touted by Trump is a temporary ban on followers of Islam coming to America alongside increased surveillance and a database of Muslims already in the U.S.

Trump has been attacked over his lack of foreign policy experience in recent days, following an interview in which he said his main consultant was 'myself', forcing him to outline a more solid approach on the issue.

The comments are likely to provide ammunition to the Clinton camp as she emphasizes the need for 'steady hands' - implying that Trump cannot be trusted with America's nuclear arsenal

In a detailed interview with the Washington Post, in which he unveiled the foreign policy consultants working with him, he outlined a non-interventionist policy, questioning America's place in organizations such as NATO.

He said: 'I do think it's a different world today, and I don't think we should be nation-building anymore. At what point do you say, "Hey, we have to take care of ourselves?"'

'So, I know the outer world exists and I'll be very cognizant of that. But at the same time, our country is disintegrating, large sections of it, especially the inner cities.'

Meanwhile Clinton has sought to use Trump's inexperience on the issue as a weapon against him, contrasting it with her own decades of insider knowledge in foreign politics.

In a speech Wednesday Stanford University, Clinton called for 'strong, smart, steady leadership,' arguing that Trump and Ted Cruz are not up to the task of combating Islamic militants.

She said: 'Turning our back on our alliances, or turning our alliance into a protection racket would reverse decades of bipartisan American leadership and send a dangerous signal to friend and foe.

'Putin already hopes to divide Europe. If Mr. Trump gets his way, it will be like Christmas in the Kremlin.'