Per an earlier commentator on SkyNews, May could lose upwards of 220 members.
Seems they are anticipating she will lose and a ‘no confidence’ vote later today will unseat her.
She survived a vote a couple of weeks ago.
It’s generally expected that even the most hard-line Brexiters in her party will not support a no confidence motion. That said there is no precedent in British history for a PM losing a vote on their signature policy by the kind of margin she is likely to lose by, and not immediately resigning. In fact, I’m not sure any government in British history has suffered a loss by more than 200 votes.
She should (but probably won’t) hand in her notice to the Queen and ask HM to dissolve Parliament and call a general election.