Trump Signs Executive Order Delivering ‘Hard-Hitting’ Sanctions Against Iran

President Trump struck back Monday at Iran by issuing “hard-hitting” financial sanctions against Supreme Leader Ayatollah Ali Khamenei and his associates.

“Today’s action follows a series of aggressive behaviors by the Iranian regime in recent weeks including shooting down a U.S. drone,” the president said in the Oval Office, calling Khamenei “responsible for the hostile conduct of the regime.”

Trump said the sanctions “will deny the supreme leader and the supreme leader’s office and those closely affiliated with him and the office access to key financial resources and support.” Speaking to reporters in the White House briefing room Monday, Treasury Secretary Steven Mnuchin said the sanctions “lock up literally billions of dollars more of assets.”

“Along with that action today, we are also announcing specific actions targeting those responsible for recent activities,” Mnuchin said, adding that the president has instructed him to sanction Iran’s Foreign Minister Javad Zarif “later this week.”

The Treasury Department, in a news release, said “any foreign financial institution that knowingly facilitates a significant financial transaction for entities designated under this Executive Order could be cut off from the U.S. financial system.”

What the Data Actually Says About Abortion and Women’s Health

California’s New Congressional Maps Favoring Dems Could Be Struck Down by the Supreme Court: Report

Breaking: OJ Simpson Witness and LAPD Detective Mark Fuhrman Dead at 74

Report: Immigrants Are Voluntarily Leaving US in Record Numbers Under Trump

DC Bar lawyer withdraws from Ed Martin disciplinary case after partisan posts surface

Hegseth unleashes on Massie in GOP primary showdown against Trump-backed Navy SEAL vet

Austin shooting suspect named, timeline of terror revealed after teens’ alleged 28-hour, 12-attack rampage

Mark Fuhrman, detective at center of OJ Simpson murder trial, dead at 74

Senate Republicans confirm nearly 50 of Trump’s picks for energy, land management

WATCH: Mamdani bashed for going ‘full deranged marxist’ with rip on famous Ronald Reagan line

Breaking: 2 Shooters at California Islamic Center Neutralized – Multiple Causalities Confirmed

Trump Sends First of Its Kind Message to ‘Rededicate 250’ Attendees Who Flooded the National Mall to Recommit America to God

Skid Row election scheme allegedly fueled by pocket-change payoffs busted by Trump DOJ

WATCH: Eye-popping illegal immigration stat prompts senator’s demand to ‘redouble’ deportations

Senate Republican threatens to derail ICE, Border Patrol package over Trump’s billion-dollar request

Amid the newly announced sanctions, Fox News has confirmed that the U.S. military also carried out a cyberattack against Iran last Thursday even as the president nixed plans for airstrikes in response to the downing of an American drone.

Sources said U.S. Cyber Command launched the cyberattack targeting the Iranian intelligence and radar installations used to down the U.S. Navy drone last week.

Fox News has learned Iran shut off some of its military radar sites around the time the U.S. was poised to launch retaliatory strikes. It’s not clear if those radar sites were turned off by the cyberattack or if Iran shut them off deliberately in anticipation of this.

Yahoo! News first reported on the retaliatory cyber strike. It came as the White House and Pentagon were also considering military strikes, but Trump revealed last Friday that he called them off after learning up to 150 Iranians could be killed.