President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE in an early morning tweet on Sunday blasted an Obama-era payment to Iran, saying he has “never gotten over the fact” that no lawmakers or federal law enforcement officials called for an investigation.

“Never gotten over the fact that Obama was able to send $1.7 Billion Dollars in CASH to Iran and nobody in Congress, the FBI or Justice called for an investigation!” he tweeted.

Never gotten over the fact that Obama was able to send $1.7 Billion Dollars in CASH to Iran and nobody in Congress, the FBI or Justice called for an investigation! — Donald J. Trump (@realDonaldTrump) February 18, 2018

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Trump also criticized the FBI in a tweet late Saturday, saying it is not acceptable that the agency “missed all of the many signals sent out by the Florida school shooter.”

The president said the FBI is “spending too much time trying to prove Russian collusion with the Trump campaign.”

“Get back to the basics and make us all proud!” he added.

Very sad that the FBI missed all of the many signals sent out by the Florida school shooter. This is not acceptable. They are spending too much time trying to prove Russian collusion with the Trump campaign - there is no collusion. Get back to the basics and make us all proud! — Donald J. Trump (@realDonaldTrump) February 17, 2018

The FBI said on Friday that it had failed to follow "protocols" when it received a tip about the alleged gunman who went on a rampage last week at a Florida high school, killing 17 people and wounding 14 others.

A person close to the suspect called the FBI's public tipline in January and raised concerns about the suspect, the bureau said.

But the FBI never reported the tip to its Miami field office or investigated it, it added.

In addition to the implementation of the international nuclear accord and a prisoner swap to secure the release of five Americans, the Obama administration in early 2016 also sent Iran $1.7 billion to resolve a dispute surrounding an arms deal signed just before the 1979 Islamic Revolution.

The White House at the time denied the payment was "ransom."

But critics of the Iran nuclear agreement and the Obama administration’s engagement with Iran accused the White House of emboldening Tehran by flooding its economy with cash.

Trump has frequently criticized the Iran nuclear agreement, which he has called the “worst deal ever negotiated.”

In January, the White House said the president would again waive sanctions against Iran that were lifted as part of the landmark 2015 deal.

Trump at the time warned, however, that it would be the last such waiver, and called for a follow-up deal with Europeans and a legislative fix from Congress.

"Today, I am waiving the application of certain nuclear sanctions, but only in order to secure our European allies' agreement to fix the terrible flaws of the Iran nuclear deal," Trump said in a statement.

"This is a last chance. In the absence of such an agreement, the United States will not again waive sanctions in order to stay in the Iran nuclear deal. And if at any time I judge that such an agreement is not within reach, I will withdraw from the deal immediately. No one should doubt my word."

—This developing report was last updated at 8:01 a.m.