U.S. Defense Secretary Pete Hegseth and Gen. Dan Caine, Chairman of the Joint Chiefs of Staff, are set to testify before a Senate committee as lawmakers examine the Pentagon's defense budget, military priorities, and the costs associated with the ongoing conflict involving Iran.

The war with Iran has cost $37.5 billion so far, according to US Defense Secretary Pete Hegseth, but the bill is likely much higher, experts have told CNN.

Senators are preparing to grill Defense Secretary Pete Hegseth over the U.S. war against Iran. Hegseth and other officials are appearing before the Senate Appropriations Committee…