Trump warns Iran of 'great and overwhelming force'

President Donald Trump warned Iran Tuesday against attacking U.S. targets, saying that if Tehran chooses to do so it will face a daunting response.

"Any attack by Iran on anything American will be met with great and overwhelming force," tweeted Trump. "In some areas, overwhelming will mean obliteration."

The stark warning follows Iran's downing of an American reconnaissance drone last week.

Tehran maintains the aircraft violated its airspace when it was targeted with a surface-to-air missile, a claim Washington disputes saying the drone was over international waters.