that's all I need

(something) is all (one) needs

Said ironically to indicate that something is not wanted or needed at all. Great, more interns to train—that's all I need! We're already struggling to keep up with everything our kids are doing, so a house full of relatives is all we need right now.
See also: all, needs
Farlex Dictionary of Idioms.

that’s ˈall I need

(informal) used when something bad happens in a situation which is already bad: The car’s broken down? That’s all I need!
See also: all, need
Farlex Partner Idioms Dictionary
See also:
  • (something) is all (one) needs
  • That’s all someone needs
  • That's all needs
  • (something) is just what (one) needs
  • I've seen worse
  • seen worse
  • none the worse (for something)
  • none the worse for
  • none the worse for something
  • vote of confidence