Is this a constitutional crisis? No. Might there be one? Yes. Is this a democratic and political crisis? Absolutely.

The government is not acting unconstitutionally. A large part of the power of the executive is its control of parliamentary time, including the ability to choose the timing of a Queen’s Speech. The government is simply using its legitimate power to make life more difficult for those who oppose its policy.

It is also not acting incomprehensibly. Boris Johnson believes that he can get the EU to shift its position and offer a new deal. But only if it seriously believes that there is a prospect of no deal.

This may be thought unrealistic by some people (me included) but it is vital to understand