UK parliamentary rules state that an amendment 'which is the same, in substance' as an issue that has already been voted on, cannot be proposed again in parliament.
The speaker has been accused of overreach by blocking a third meaningful vote, but why did Theresa May presume she could bend parliamentary rules?
It looks like the prime minister will try for a third vote on her deal before asking the EU for a Brexit delay.
Even if the UK decides it can withdraw from the Irish backstop unilaterally under international law, there will be consequences.
A series of amendments failed, but the prime minister must now appeal for more time.
MPs can't actually prevent no deal with this vote, but that doesn't make it meaningless.
A last minute meeting with the EU couldn't save her universally detested deal. Now there's less than three weeks to Brexit – and no one knows what to do.
Two bills currently before the British parliament seek to reduce the 12 month ban on asylum seekers from working.
Quitting Labour and Conservative MPs need to decide where to position themselves if they want to keep their seats. Even then, it's going to be a slog.
Here's what needs to happen if the UK's newest political formation wants to stand in elections as a party.
Parliaments might argue more but they make democracy more stable and produce stronger economies.
MPs want the prime minister to get back to the negotiating table, but will anyone from the EU be willing to meet her?
The prime minister has failed to present anything different to parliament. Here's what could happen now.
Corbyn says he won't talk to the prime minister until she takes no-deal Brexit off the table. But will his gamble deliver the election he wants?
As Brexit heads towards breaking point, the British people need to define what they think is in the national interest.
The PM has pledged to hold cross-party talks after failing to get her deal through parliament. But time is running out.
There is little the EU can do while the UK is in disarray.
After her historic loss in parliament, the PM will hold cross-party talks to find a way out of the impasse. But will she really be listening?
The UK government has lost a key vote on Brexit – here are the options facing the prime minister.
If it loses the key Brexit vote next week, the government will have just three days to come up with a plan B.