The warning came in response to Donald Trump's threats to hit 52 Iranian targets. Iran's Labor News Agency said Iranian lawmaker Abolfazl Abutorabi made the threats during an open session of parliament on Sunday. He said: “We can attack the White House itself, we can respond to them on American soil.
"We have the power and, God willing, we will respond at an appropriate time."
Abutorabi added: “This is a declaration of war, which means that if you hesitate you lose.
“When someone declares war, do you want to respond to candy with flowers? They will shoot you in the head.
The session opened in Tehran on Sunday, just a few days later Iranian military commander general Qassem Soleimani was killed in a US drone attack at Baghdad airport.
General Soleimani was considered the architect of Tehran's clandestine and military operations abroad as chief of the Revolutionary Guards' Quds Force.
His body was flown to the southwest city of Ahvaz I ran on Sunday after massive marches at the funeral in Iraq.
The scenes show a coffin wrapped in an Iranian flag being unloaded from a plane while a military band played while crowds shouted "Death to America" angrily.
Major General Hossein Salami, commander of the Revolutionary Guard, has promised "a strategic revenge that will definitely end the US presence in the region."
Trump has vowed to hit 52 critical targets in Iran in retaliation if Tehran hits any US interest in the region.
Raising stakes, Iran said it had identified 35 targets for potential attacks and raised its red "revenge flags" on a large mosque.
Trump card tweeted on Saturday from Mar-a-lago: “Let this serve as a warning that if Iran hits any Americans, or American assets, we will target 52 Iranian sites (representing the 52 American hostages taken by Iran many years ago) , some at a very high level and important to Iran and Iranian culture, and these targets, and Iran itself, will be hit very quickly and hard. The US no longer wants threats! "
He added: “Iran is talking very boldly about attacking certain US assets in revenge for ridding the world of its terrorist leader who had just killed one American and seriously injured many others, not to mention all the people he killed because of your death. recently including hundreds of Iranian protesters.
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“He was already attacking our embassy and preparing for additional attacks elsewhere. Iran has been a problem for many years. "
The president was accused of threatening to commit "war crimes" after suggesting places of importance to "Iranian culture".
His threat to hit sites important to "Iranian culture" drew many accusations from critics that he was threatening to commit "war crimes."
Earlier Saturday, an Iranian official said at least 35 US targets, including warships and Tel Aviv, were identified by retaliatory attacks.
An Iranian retaliatory attack could be seen "within weeks" at home or abroad, a senior congressional official told Time magazine.
They said: “There is no indication that there will be a decrease in the near future. The only question is how bad will retaliation be and where and what will it hit. "
Iran's President Hassan Rouhani visited General Soleimani's family on Friday.
While there, he warned that the US had made a "serious mistake" by killing General Soleimani and will face consequences in the coming years.
He added: "This crime committed by the US will go down in history as one of the unforgettable crimes against the Iranian nation."