CHICAGO — President Donald Trump’s attempts to deploy the military in Democratic-led cities — over the objections of mayors and governors — has brought a head-spinning array of court challenges and overlapping rulings.

As the U.S. Supreme Court ponders whether to clear the way for the National Guard in Chicago , a federal appeals court is hearing arguments in California Gov. Gavin Newsom’s challenge to the deployment of troops in Los Angeles. Guard troops could also soon be on the ground in Portland, pending legal developments there.

Here are some things to know about legal efforts to block, or deploy, National Guard troops in various cities.

Donald Trump’s use of the National Guard sets up a legal clash testing presidential power

Supreme Court ruling to come; federal judge weighs

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