Time isn't on the market's side today

The House aims to have a procedural vote by 11:15 am ET (1515 GMT) and a final vote by 4:45 pm ET (2045 GMT).

That's a potentially crazy scenario where the voting takes place just before the FX market closes for the week.

At the moment, CNBC's John Harwood says there are 'around 18' Freedom Caucus members who will vote against it. 22 is the magic number but more than 4 moderates have said they will vote against it.

It might be very close.