President Trump’s decision to downsize the National Security Council staff has evoked howls of protest from members of the media and from former NSC staffers under President Joe Biden — at times they are one and the same. These critics argue that Trump is “removing part of his government’s brain” and increasing the risk of America being unable to address and respond to a developing crisis.

Their case would be much stronger if the NSC had, for example, understood the risks of a hurried withdrawal from Afghanistan and planned a more deliberate departure from that country.

Biden had reduced the size of the National Security Council staff, which at its apogee under President Barack Obama stood at 400. Yet the Obama administration failed to stop Bashar Assad’s chemical attacks on Syrian rebels and negotiated an agreement with Iran that Tehran began to violate before its ink had even dried.

Nor did a 200-person NSC staff under President George W. Bush successfully coordinate the warring State and Defense Departments — a contributing factor to U.S. failures in both Iraq and Afghanistan.

It is noteworthy that President George H.W. Bush — who managed a highly successful foreign and national security policy, including an outright victory over Saddam Hussein — relied upon no more than 60 NSC professionals. Their leader, Brent Scowcroft, is widely acknowledged to have been the........

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