The crushing “economic D-Day” sanctions being unleashed against Iran will be “the single greatest financial offensive ever marshaled against an adversary,” Treasury Secretary Scott Bessent said hours before they are revealed Monday.

The imminent announcement of the impending monetary penalties follows Bessent’s feedback on CNBC Friday that the US would “collapse the regime” with the “toughest sanctions in history” as President Trump warned any nation offering “any type of lifeline” to Iran would face their own financial penalties.

“President Trump has dismantled Iran’s military capabilities, destroyed nearly 100 percent of its military factories and buried its nuclear program,” Bessent wrote Sunday night time on X.

US Treasury Secretary Scott Bessent is set to unleash financial ‘D-Day sanctions’ against Iran. Andrew Thomas / CNP / SplashNews.com

“We are now entering the endgame. As dawn begins an economic D-Day – the single greatest financial offensive ever marshaled against an adversary,” he continued.

Tehran last week pledged “crushing, punishing and devastating” penalties should the US transfer forward with its deliberate crippling sanctions.

But Bessent seemingly batted down the menace in his Sunday social media publish.

“The Islamic Republic has subsisted by dressing extortion as security guarantees. It has drawn strength from a calculus that regards Iranian retaliation as certain and American enforcement as negotiable,” he wrote

A veiled Iranian girl walks previous an anti-US billboard that includes US President Donald Trump in southern Tehran, Iran, on Monday, August 24, 2026. ABEDIN TAHERKENAREH/EPA/Shutterstock

US sailors observe an MH-60R Sea Hawk touchdown on the flight deck aboard USS Ross (DDG 71). CENTCOM

“Under President Trump, that era is over. And those who fear the danger of defying Tehran ought not to discount the cost of testing Washington.”