President Trump early Thursday echoed his national security adviser’s comments a day earlier that Iran is now formally “on notice” for firing a ballistic missile.

“Iran has been formally PUT ON NOTICE for firing a ballistic missile. Should have been thankful for the terrible deal the U.S. made with them!” he tweeted, without providing any other details.

Iran has been formally PUT ON NOTICE for firing a ballistic missile.Should have been thankful for the terrible deal the U.S. made with them! — Donald J. Trump (@realDonaldTrump) February 2, 2017

“Iran was on its last legs and ready to collapse until the U.S. came along and gave it a life-line in the form of the Iran Deal: $150 billion,” he added.

Iran was on its last legs and ready to collapse until the U.S. came along and gave it a life-line in the form of the Iran Deal: $150 billion — Donald J. Trump (@realDonaldTrump) February 2, 2017

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Michael Flynn during a surprise appearance in the White House briefing room on Wednesday vowed a more muscular U.S. response to Iran’s “destabilizing behavior across the Middle East.”

Flynn said Iran “continues to threaten U.S. friends and allies in the region” with a ballistic missile test launch over the weekend and other actions.

Flynn also blamed former President Barack Obama Barack Hussein ObamaBiden to hold call with Senate Democrats on Thursday: report Romney undecided on authorizing subpoenas for GOP Obama-era probes Billboards in four states and DC demand ICE 'free the families' MORE for allowing Iran to become “emboldened.”

“As of today, we are officially putting Iran on notice,” he said.

The White House on Wednesday provided little clarity about the practical impact of Flynn’s comments.

“There are a large number of options available to the administration. We are going to take appropriate action and I will not provide any further information today relative to that question,” a senior administration official told reporters.

“The important thing here is we are communicating that Iranian behavior needs to be rethought by Tehran.”

Trump has in the past criticized the international agreement to curb Iran's nuclear program and vowed to abandon the agreement if elected. The agreement to offer relief from international financial sanctions in exchange for new limits on Iran's nuclear program isn't a treaty and therefore isn't binding from one administration to the next.

In November, nuclear policy experts and lobbyists said Obama's signature nuclear deal with Iran could be put in peril when Trump assumes office.

On Wednesday night, the president tweeted that Iran is dominating "more and more of Iraq," despite U.S. efforts to secure the country.

Katie Bo Williams contributed to this breaking news report, which will be updated.