Mr. Mattis told senators on Tuesday that it was in America’s interest to stick with the deal, which Mr. Trump has often dismissed as a “disaster.”

“Absent indications to the contrary, it is something that the president should consider staying with,” Mr. Mattis told members of the Senate Armed Services Committee after being repeatedly pressed on the issue.

The comments were the latest example of how Mr. Trump’s instincts on national security — to threaten North Korea with destruction and tear up an Iran accord that most experts and allies say is working — are running headlong into opposition from his own National Security Council.

But rather than keep those arguments inside the White House Situation Room, where similar battles have played out over many presidencies, Mr. Trump’s key advisers are making no secret of their disagreements with their boss.
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hmmmm