WASHINGTON, April 29 (Reuters): The United States' war in Iran has ​cost $25 billion so far, a senior Pentagon official said on Wednesday, providing the first official estimate of the military's tag for the conflict.

With just six months before midterm elections in which President Donald Trump's Republicans may face an uphill battle to keep their House majority, Democrats are riding high in public opinion polls as they attempt to link the unpopular Iran war with affordability.

Jules Hurst, who is performing the duties of the ​comptroller, told lawmakers on the House Armed Services Committee that most of that money was for munitions.

Hurst did not detail ​what that cost estimate included and whether it took into account the projected costs of rebuilding and repairing ⁠base infrastructure in the Middle East damaged in the conflict.

Rep. Adam Smith, the top Democrat on the House Armed Services Committee, responded to ​Hurst: "I'm glad you answered that question. Because we've been asking for a hell of a long time, and no one's given us the ​number."

The $25 billion cost is equal to the entire budget of NASA for this year.

But it is unclear how the Pentagon arrived at the $25 billion amount given that a source had told Reuters last month that President Donald Trump's administration estimated that the first six days of the war had cost the United States at ​least $11.3 billion.

Photo from Reuters