Reuters reports

Brexit

It has been known that they will meet for a Cabinet meeting later at 1000 GMT but it is now said that they will be briefed earlier at 0900 GMT on how to address parliament's attempts to take control of the Brexit process.

Remember, the 'indicative votes' amendment/legislation will be key today and surely May will want to whip her ministers to get on her side and vote that down. If that fails, I don't see how she can carry on with her job as prime minister.