Washington (CNN) United States' Ambassador to the United Nations Nikki Haley said Sunday the Trump administration will announce more sanctions against Russia as soon as Monday.

On CBS's "Face the Nation," Haley said the Treasury Department will announce the new sanctions and insisted the US has sent "a strong message" about the use of chemical weapons.

"You will see that Russian sanctions will be coming down," said Haley, reiterating what she said earlier on Fox News. "Secretary Mnuchin will be announcing those on Monday, if he hasn't already."

A source familiar with the matter told CNN more than a dozen entities, including banks and equipment suppliers, are being looked at, and at least several are expected to be sanctioned. Also under consideration are Russian companies that sell helicopters and helicopter parts to Syria, sources familiar with the matter said.

While insisting the action taken early Saturday morning in Syria was "a very strong attack on the chemical weapons program," Haley hit back on more hawkish critics who argue the US didn't go far enough because it did not change the balance of power in the long-running Syrian civil war.

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