New Delhi, March 30 -- US President Donald Trump has warned that Iran will face bombing if it continues to develop nuclear weapons.

"If they don't make a deal, there will be bombing," Trump told NBC News in an interview on Saturday. He also threatened additional economic pressure through "secondary tariffs" to deter Iran's nuclear activities.

Despite the tough rhetoric, Trump acknowledged that US and Iranian officials are "talking," though he did not provide details.

His latest comments escalate his previous warning that if Tehran refuses to negotiate a new nuclear agreement, "bad, bad things are going to happen to Iran."

Trump revealed in early March that he had sent a letter to Iran's Supreme Leader Ayatollah Ali Khamenei proposing ...