That we don’t need any of them in this White House
Answer: It is a proper question
Explanation:
The witness is making a claim about what had transpired between the defendant and the plaintiff and in order for their testimony to stand, they need to have integrity such that a reasonable person can believe their testimony in this case.
In asking about the false claim that the witness had once filed, the defendant is trying to establish that the witness has no integrity and so in proving their untruthfulness, the defendant hopes to convince the court that the witness does not have enough integrity to be a witness.
It means be quiet or shut up