This latest Trump threat is horrifying, and he should absolutely not adjourn Congress on this pretext and for this purpose.

However, his power to do so under Art. II, §3 does *not* appear to be limited to "extraordinary Occasions." https://twitter.com/JonathanTurley/status/1250547609607036929

"Extraordinary Occasions" would appear to refer only to his power to convene either or both houses.

The president's power to adjourn Congress seems to be limited only to "Disagreement between them, with Respect to the Time of Adjournment."

This is not only apparent from the structure of the text, but also from Federalist No. 77, where Hamilton's language more clearly differentiates between the power to convene and the power to adjourn, and conditions only the former on extraordinary occasions.

However, Hamilton is also careful, in Federalist No. 69, to distinguish the president's power from the British monarch's power to prorogue Parliament.

Hamilton emphasizes the president can only adjourn Congress "in the single case of disagreement about the time of adjournment."

This would suggest that the disagreement between the House and Senate must be about the *time* of adjournment, and not whether or not *to* adjourn.