Ian Blackford has revealed he would move a motion to revoke Article 50 if the UK faced a no-deal Brexit.
Appearing on the breakfast show, the politician said he believed leaving the EU without a deal would be "disastrous".
"We have to be prepared to support revoke," he told talkRADIO's Julia Hartley-Brewer.
"If it's no-deal, then I will move a motion for revoke because we need to stop the UK crashing out of the EU with no-deal, which I believe would be disastrous."
However, the SNP Westminster Leader said that the government's next steps should be holding a second referendum.
"I don't think there is such a thing as a good Brexit," he added.
"I think it's right given where we are that the population of the UK are given the opportunity to have a say."