'It's not the concept of leaving,' he told Fox News anchor Sean Hannity.
'It's the way they withdrew. It was not even possible to believe.'
The former president has kept up a running commentary on the unfolding disaster in Afghanistan, denouncing Biden's handling of the withdrawal and maintaining he would have managed a safe, swift operation when the time was right.
Biden and his officials have in turn announced their hands were tied by an agreement struck with the Taliban by Trump.
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Though, the former president announced he made clear in discussions there would be outcomes if Mullah Abdul Ghani Baradar, the Taliban's political chief, failed to stick to the terms of their deal.
'We had a very strong conversation,' he stated.
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'I told them upfront, I said: 'Look, before we start, let me just tell you right now that if anything bad happens to Americans or anybody else, or if you ever come over to our land, we will hit you with a force that no country has ever been hit with before, a force so great that you won't even believe it, and your village, and we know where it is - and I named it - will be the first one.'
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Baradar flew back to Afghanistan on Tuesday and is among the leading contenders to head the new government.
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Trump's remarks come after the Taliban - hours after they assured their rule would be 'moderate' - started using whips and sharp objects to hit back Afghans gathered along the walls of Kabul airport.
One man was photographed with tears streaming down his cheeks, his face contorted in anguish as he witnessed his fellow Afghans being whipped.
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Women were recorded reaching their hands through iron railings towards US troops while yelling 'the Taliban are coming' in footage being circulated on Afghan social media accounts this morning.
Meanwhile, more footage exposed crowds hard up against concrete perimeter walls on the airport's military north side, with shots being fired over the heads of men, women, and children to keep them back.
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Taliban gunmen have enclosed the airport - the single route out of Afghanistan for thousands of refugees stranded in the capital and nearby provinces - and are checking the documents of those attempting to reach it.
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Islamist fighters were funneling people towards a gate on the airport's civilian south side, requiring documents before occasionally letting someone pass. Each time the gate opened, dozens attempted to rush inside - with gunshots fired to keep them back.
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