Mr Johnson doesn't actually have the power to suspend Parliament. That power lies with the Queen along with the Privy Council.
https://www.abc.net.au/news/2019-08-29/heres-how-boris-johnson-will-suspend-parliament-ahead-of-brexit/11458784
Could the Queen have said no?
Why the monarchy still matters
In an era when representative government is despised, we should not be surprised if monarchy becomes ever more popular, writes Philip Blond.
Yes, she has the power to do so. But it's not that straightforward.
Normally, the Queen being asked to prorogue Parliament is a matter of procedure and has been a formality in the United Kingdom for more than a century.
But given the situation with Brexit, the Queen's decision to reject a Prime Minister's request might have had more political ramifications.
It could also trigger a constitutional crisis.
So it was quite unlikely she would have denied the request.
Many more details and questions answered re: the process, what the opposition can do to fight it, and what happens next with detailed deadlines at the article link above.
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