Which legislative power has never been used by a president

A - adjourning congress

B - using line item veto

C - issuing a signing statement

D - using the poker veto

The correct answer is A which is adjourning congress.

Adjourning congress will not be used by the president unless he or she is a member of the House of Representatives. It may be done by a Speaker or the Senate majority leader to reconvene congress at an earlier date to address and important issue or emergency.