Ben Wallace said exercises are being carried out to prepare for such an atrocity.
ISIS has the capabilities to produce their own mustard gas, having already used the tactics in the Middle East.
Troops fighting against the terror group have been left with appalling injuries – including agonising blisters on their skin and badly damaged lungs – in a frightening echo of warfare in the trenches on the Western Front.
Ingredients to make these bombs are fairly common and easy to obtain, as most of them have other, legal uses.
Mr Wallace told the Sunday Times: 'They have no moral objection to using chemical weapons against populations and, if they could, they would in this country.'
As well as having ISIS to deal with, the MP for Wyre and Preston North stated that Al-Qaeda is back on the rise and becoming an increasingly credible threat, and that the biggest threat to the UK is cyber attacks.
He also encouraged citizens to be vigilant and report any suspicious behaviour to identify 'the enemy within', as he fears foreign agents and colleagues could be corrupted by criminal gangs.