The practice of appointing White House “czars” to rule over various issues or regions is not a new invention. But centralized management by the White House staff has been greatly increased in recent years.

Beyond constitutional questions, such White House advisers, counselors, staffers and czars are not accountable. They cannot be called to testify under oath, and when Congress asks them to come, they typically plead executive privilege.

The consequences, apart from the matter of legitimate governance, are all too often bad for the formation and execution of policy. The departments, not the White House, have the capacity to carry out policies and they are full of people, whether political appointees or career governmental employees, who have vast experience and much to contribute to the making of ­policy. When White House staffers try to formulate or execute policy, they can easily get off track in a way that would not happen in a regular department.

As secretary of state under President Ronald Reagan, I experienced this with great pain when White House people developed and ran an off-the-books program of arms sales to Iran. It erupted in the Iran-Contra scandal involving the unconstitutional transfer of funds not appropriated by Congress to the Contras, and with close to devastating consequences for the president.