Can no-deal Brexit be stopped?31 Aug 2019 19:51
What happens in Parliament is usually up to the government of the day, so MPs would have to find a way to wrest control of the timetable.
Emergency debate
You might hear the phrase "SO24" over the next few weeks. This refers to Standing Order 24, the rule that allows MPs to ask for a debate on a "specific and important matter that should have urgent consideration".
These debates usually have no power to force action. But it would be possible to give them more teeth if House of Commons Speaker John Bercow allows amendments.
For example, MPs could try to take control of the timetable for a day, to try and force through a whole piece of legislation.
The new law could simply force the PM to request an extension to the Brexit deadline.
Theoretically, there is enough time for this.
Any new law has to pass through all stages of both Houses of Parliament. This would usually take weeks, but it could be done in as little as three days. This happened in April when Yvette Cooper managed to rush through a piece of legislation to force an extension.
But even if MPs managed to force it through in three days, they would probably have to allow for a day to secure and another day to hold the emergency debate. With as few as four sitting days before parliament is prorogued, this could be tight.