In a tweet on late Sunday, Trump warned his Iranian counterpart Hassan Rouhani that if Tehran threatened the U.S. again, it would suffer "consequences the likes of which few have ever suffered before".
"For the last few years they were pampered by the worldwide community and President Trump came in and said that's it. Enough".
"We are about to pull off something very big".
Mr Trump's warning came hours after a speech by US Secretary of State Mike Pompeo, who denounced Iran's clerical leadership as a "mafia" and promised unspecified backing for Iranians unhappy with their government.
After being involved in a war of words and slamming "mafia-like" Iran, Mr Trump suggested that the United States could find common ground with the Islamic Republic.
"The United States is with you", Pompeo said according to prepared remarks released in advance of his speech at the Ronald Reagan Presidential Library and Museum in Simi Valley.
Trump called for Rouhani to stop the rhetoric or "suffer the consequences the like of which few throughout history have ever suffered before".
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Rather than learn from their neighbour's history, it appears Iran may now be bent on taking the same path.
The other signatories to the deal have vowed to stand by the deal.
Iran insists its nuclear programme is entirely peaceful, and its compliance with the deal has been verified by the International Atomic Energy Agency (IAEA), which has said Iran is honouring its commitments. Washington is now gearing up to re-impose some of the punishing sanctions that brought Iran to the table in the first place.
There is little interest among United States lawmakers for a conflict with Iran.
"We are asking every nation who is sick and exhausted of the Islamic Republic's destructive behavior to join our pressure campaign".
Danon says the regime is anxious and that's why there were so many tweets and comments and that the new administration is doing the right thing.
Twitter has come a long way since it's arrival in 2006.
As for how Trump's response has been received, Iran's state news agency said the tweet was typical of the American president's "bullying words". He said that such threats will be "met with fire and fury and frankly power, the likes of which this world has never seen before". "Besides, you basically made the same threat to KJU before your Singapore meeting and North Korea's nuclear program is stronger than ever", he concluded.