Convene and adjourn Congress
This power has been used to legislate anything from nominations to war declarations to emergency management. Not only can the president adjourn Congress in states of emergency, but this power may also be utilized to bring members to the table when chambers disagree on when to adjourn.
The Constitution states that the President "may, on extraordinary occasions, convene both Houses, or either of them and in case of disagreement between them, with respect to the time of adjournment, he may adjourn them to such time as he shall think proper." with the provision that "Neither House, during the session of Congress, shall, without the consent of the other, adjourn for more than three days . . . (art. I, § 5,cl. 4)"