Pompeo in a statement called it a "major expansion" of the Iran metals-related sanctions administered by the State Department.
The sanctions, imposed under the Caesar Syria Civilian Protection Act and other measures, come as the Syrian leader grapples with a deepening economic crisis after a decade of war.
Turkey’s purchase of Russian weapons and drilling off of Cyprus has angered its Western allies.
“These companies’ role and aim is to circumvent (Western) sanctions on Cham Holding.”
Blacklisted firms cannot buy components from US companies without US government approval.
Officials claim no violation of Iran deal • Questions abound
The rial's decline has continued despite assurances from the Iranian Central Bank governor that the bank had injected hundreds of millions of dollars to stabilize the currency market.
The ruling VVD party and the Party for Freedom were among the parties that opposed the motion titled “Measures in case Israel goes ahead with annexing Palestinian area.”
In early June, US President Donald Trump urged Iran to make a deal with America.