A former deputy secretary of State to President Obama says that the Trump administration is unprepared for a major terrorist attack or other foreign incident that requires a U.S. response.

In an op-ed for The New York Times, Antony Blinken argued Tuesday that the administration has been rattled by high turnover and the president's disregard for policy.

"[N]o administration in modern memory has been less prepared to deal with a true crisis than this one," Blinken wrote, citing a reduction in the reported number of meetings of several White House committees including the National Security Council, headed by John Bolton, as a warning that policy is being made with little deliberation among advisers.

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"Some combination of these committees typically met multiple times a day," he continues. "Now, it is reportedly once or twice a week at most. The result is greater control of the policy process for Mr. Bolton and fewer messy meetings in which someone might challenge his wisdom."

Blinken went on to argue that the Trump administration had no "plan B" for what to do if Venezuela's political crisis dissolves into violence.

"Take the meltdown in Venezuela. The administration deserves credit for leading the international isolation of the country’s illegitimate president, Nicolás Maduro," Blinken wrote. "But there is no evidence it has a comprehensive strategy to advance a peaceful transition — or a Plan B if Mr. Maduro digs in or lashes out."

The Trump administration has been rattled by high-profile departures, including Secretary of Defense James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE and White House chief of staff John Kelly John Francis KellyMORE, who both departed last month.

The president last month attacked news reports of his difficulty in finding Kelly's replacement as "fake news" shortly before Mick Mulvaney Mick MulvaneyMick Mulvaney to start hedge fund Fauci says positive White House task force reports don't always match what he hears on the ground Bottom line MORE was named acting White House chief of staff.