Sen. Bob Menendez Robert (Bob) MenendezKasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report VOA visa decision could hobble Venezuela coverage MORE (D-N.J.), the ranking member of the Senate Foreign Relations Committee, slammed President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE for appearing to backtrack on a remark from U.S. Ambassador to the United Nations Nikki Haley Nimrata (Nikki) Haley'The soul' versus 'law and order' Author Ryan Girdusky: RNC worked best when highlighting 'regular people' as opposed to 'standard Republicans' GOP lobbyists pleasantly surprised by Republican convention MORE that the administration would announce new Russia sanctions on Monday.

“UN Amb @NikkiHaley said Russia sanctions were coming today. Now WH says theyre not sure? The reversal is astounding,” Menendez wrote on Twitter.

“Either Pres.Trump doesn't think we need more action or they cant handle a simple rollout announcement. Mr. President, get your act together. What's the strategy?”

UN Amb @NikkiHaley said Russia sanctions were coming today. Now WH says theyre not sure?



The reversal is astounding. Either Pres.Trump doesn't think we need more action or they cant handle a simple rollout announcement. Mr. President, get your act together. What's the strategy? https://t.co/OofPJPtnQg — Senator Bob Menendez (@SenatorMenendez) April 16, 2018

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Haley said during a Sunday show interview that the U.S. on Monday would announce sanctions targeting Russia for its support of Syrian President Bashar Assad.

"Russia sanctions will be coming down. [Treasury] Secretary [Steven] Mnuchin will be announcing those on Monday if he hasn't already, and they will be going directly to any sort of companies that were dealing with equipment related to Assad and chemical weapons use," Haley told CBS News's "Face the Nation."

But White House press secretary Sarah Huckabee Sanders struck a different tone on Monday.

“We are considering additional sanctions on Russia and a decision will be made in the near future,” Sanders said, according to the White House pool.

The U.S. has blamed Assad for an apparent chemical weapon attack earlier this month in the rebel-held Syrian city of Douma. Meanwhile, Trump has implicated both Iran and Russia, two countries that have provided the Syrian government with both political and military support throughout the country’s civil war.

“Many dead, including women and children, in mindless CHEMICAL attack in Syria. Area of atrocity is in lockdown and encircled by Syrian Army, making it completely inaccessible to outside world,” Trump said earlier this month.

“President Putin, Russia and Iran are responsible for backing Animal Assad.”