Iranian President Hassan Rouhani told President Trump not to impose sanctions on the regime, warning the Iranians could restart their nuclear program “within hours” in retaliation.

“If they are inclined to get back to those experiences, Iran would certainly return in a short time — not a week or a month but within hours — to a situation more advanced than before the start of negotiations,” Rouhani told Iranian parliament, per a semi-official domestic media outlet.