WASHINGTON — House Democrats unsuccessfully attempted to pass a resolution to halt Donald Trump’s war with Iran on Thursday — a response to the president’s shocking threat two days earlier to annihilate “a whole civilization.

The eventual ask of Congress is likely to fall to between $80 billion and $100 billion, officials said, less than half the amount of an earlier proposal to offset costs of the conflict.

The military campaign has killed Supreme Leader Ayatollah Ali Khamenei, sunk at least 10 Iranian warships and struck more than 1,000 targets.

A week of escalating rhetoric had Trump threatening to wipe out “a whole civilization” before backing down and announcing a two-week ceasefire.