Iran has sent a frightening warning to the United States and threatened an attack on Israel, according to reports.
The US military has sent forces, including an aircraft carrier and B-52 bombers, to the Persian Gulf to counter what US officials have said are "clear indications" of threats from Iran to its forces there.
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Iranian Parliament vice-speaker Ali Motahhari told media on Sunday (local time) US military forces had begun a "psychological" war, according to Iranian state news agency Fars.
"They are not ready for war, especially when Israel is within our range."
He added, "We need to continue unity and resistance because the US will be forced to change its method after a while.''
US President Donald Trump told media while he was meeting with Victor Orban - the Hungarian Prime Minister, it would be a "bad mistake" if Iran takes action.
"It's going to be a bad problem for Iran if something happens, I can tell you that, they're not going to be happy," Trump said on Monday (local time).
"You can figure it out for yourself, they know what I mean by it."
Trump's strong words came after Iran's head of the Revolutionary Guards aerospace division, Amirali Hajizadeh, said on Sunday (local time), "If [the Americans] make a move, we will hit them in the head."
Commander of the Guards Major General Hossein Salami also said in a parliament session on Sunday (local time) the US had started a psychological war in the region.
"Commander Salami, with attention to the situation in the region, presented an analysis that the Americans have started a psychological war because the comings and goings of their military is a normal matter," said Behrouz Nemati in a summary of the Salami's comments, according to parliament's ICANA news site.