bone of contention
Something that continues to be disputed; something on which no agreement can be reached.
It is still a bone of contention whether to go ahead with the original plan in light of the new evidence.
contention
UK /kənˈtɛnʃən/ US /kənˈtɛnʃən/
noun 3
Definitions
noun
1
Argument, contest, debate, strife, struggle.
2
A point maintained in an argument, or a line of argument taken in its support; the subject matter of discussion of strife; a position taken or contended for.
It is my contention that state lotteries are taxes on stupid people.
3
Competition by parts of a system or its users for a limited resource.
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