Stay on with

[Xinfu]

In assigning presentations, initially John was given Week 3, but his tutor has changed it to Week 5. Now John has to protest against this. Is it correct for him to say?

-Can I stay on with Week 3?
-Can I stay with Week 3?

[Rusty]

The first sounds British. The second works well.
I would add:
Can I keep the week I had (week 3)?

[Xinfu]

Thank you.