In a new tweet Sunday in a series of tweets in the past 24 hours, President Donald Trump once again promised to strike back at Iran "perhaps in a disproportionate manner" should Iran strike any U.S. person or target.

President of the United States also said his tweet will serve as notification to the United States Congress. "Such legal notice is not required, but is given nevertheless!" he said.

In an earlier tweet today, Trump had said that the U.S. will be sending some of the "brand new beautiful equipment" that the U.S. has spent two trillion dollars on in Iran's way "without hesitation".

On Sunday Major General Hossein Dehqan (Dehghan) a military adviser to Iran's Supreme Leader said told CNN in Tehran on Sunday that Iran's retaliation for Qassem Soleimani's killing would be an attack against a U.S. "military site."

Dehqan who appeared in the CNN interview in military fatigues is a former defense minister. He is sanctioned by the U.S. treasury for his alleged involvement in terrorist operations in Lebanon and Argentina.

This has been the most specific threat by a senior Iranian official against the United States after the January 2 targeted killing of Soleimani and four other Iranians as well as Abu Mahdi al-Muhandis, the second-in-command of Iraq's Popular Mobilization Units (PMU), and four other members of the paramilitary group.

The U.S. president tweeted Saturday saying 52 Iranian sites which are important "to Iran and the Iranian culture" will be hit has stirred some controversy in Iran and the U.S.

Secretary of State Mike Pompeo later downplayed President Trump's threat to target Iranian cultural cites, insisting that the U.S. would behave within the rules of international law while vowing that the U.S. would not hesitate to hit back hard against Iran's "kleptocratic regime" if it came under attack.

Iran's Supreme Leader has vowed to take "hard revenge" on the U.S. for killing Qassem Soleimani, the Commander of Iran's shadowy Qods Force, in Baghdad on December 2.