CNN-

New York, Connecticut, Maryland and New Jersey filed a lawsuit Tuesday claiming last year’s tax overhaul violated the constitution by unfairly targeting Democratic states.

The law puts a new cap on how much Americans are allowed to deduct for state and local taxes, or SALT, from their federal bill. Once unlimited, the deduction is now capped at $10,000. Deductions help reduce a person’s overall tax bill.

The cap will disproportionately harm high-tax states and their residents, the lawsuit says.

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