says who?
US /ˈsɛz huː/
UK /ˈsɛz huː/

1.
谁说的?, 谁说的算?
used to express doubt or disagreement with a statement, implying that the source of the information is questionable or lacks authority
:
•
You can't do that. Says who?
你不能那样做。谁说的?
•
They told me I'm not allowed to enter. Says who?
他们告诉我不能进去。谁说的?