March 24 (UPI) -- Secretary of Defense Pete Hegseth plans to request $200 billion in funding from Congress as the cost of the United States' war with Iran grows.

The request comes on top of an already record-setting Pentagon budget passed by Congress last year. Transparency over how funds are being spent continues to dwindle, experts told UPI.

As of March 15, 16 days into the war, it had cost the United States about $12 billion, Kevin Hassett, director of the National Economic Council, said in an interview on Face the Nation.

Linda Bilmes, a Harvard Kennedy School professor and former assistant secretary and chief financial officer of the U.S. Department of Commerce under the Clinton administration, told UPI the reported cost is "just the very tip of the huge iceberg."

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