One of the wives is seeking the help of unjust laws to cause harm to the other wife; what is the ruling?

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Check below answers in case you are looking for other related questions:
He has two wives and it is difficult for him to treat them fairly
She is very anxious because the second wife may inherit the same as her

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Related Answers:
Plural marriage is mustahabb for the one who can afford it; it is not obligatory
The attitudes of the Messenger of Allah (blessings and peace of Allah be upon him) towards his wives and his good treatment of them
The reason why plural marriage is permitted for men but not for women
He has two wives and it is difficult for him to treat them fairly
She is very anxious because the second wife may inherit the same as her

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