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But an opinion by Justice Brett M. Kavanaugh that accompanied the decision suggested that Mr. Trump should have some residual power to assert executive privilege.

In that case, she said, the Supreme Court also stated that former presidents retained some residual power to invoke executive privilege.

His residual power, which he must use or lose, is to influence his party’s selection of candidates for state and federal offices.

At the time, the nation did not know how close it got to a nightmare scenario: a defeated president using his residual power over the Justice Department in an effort to cling to power.

Constitutionally, this is a magisterial landmark in the assertion of parliamentary sovereignty against the residual power of the crown and ministers.