President Trump is bucking tradition and legal precedent in pushing to deploy the National Guard to Democratic-led cities such as Portland, Ore., and Chicago due to what he says is rampant crime and to support his crackdown on illegal immigration.

On Monday, the state of Illinois and the city of Chicago filed a lawsuit to stop the Trump administration from sending National Guard troops to the state – arguing that the administration has exceeded its authority under Title 10, the statute which allows the president to bring the Guard into federal service. • Legal expert: Using Federal troops domestically isn't unprecedented, but it comes with risk

Legal experts say Trump is testing the limits of presidential authority by using the rarely used statute to deploy federal troops to American c

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