A rift is opening between military leaders and Republicans over the size of the defense budget.

Republicans in Congress have hammered President Obama for a planned $487 billion cut to the Pentagon over the next decade and accused him of basing his new strategy for the military on the size of those cuts.

GOP lawmakers have repeatedly pressed Pentagon officials in recent weeks about whether the $487 billion reduction is too big of a risk for the military to take.

But the service chiefs and their deputies have held the line, providing a near-unified front in saying they support the president’s budget plan and his strategy revamp. The budget cuts involve risk, they say, but it’s an acceptable amount.