WASHINGTON — Senators for the first time are poised to question military leaders over President Donald Trump's use of the National Guard in American cities, an extraordinary move that has prompted legal challenges as well as questions about states' rights and the use of the military on U.S. soil.

The hearing Thursday before the Senate Armed Services Committee is expected to feature tough questioning for Pentagon leaders over the legality of the deployments, which in some places were done over the objections of mayors and governors.

The hearing will bring the highest level of scrutiny to Trump's use of the National Guard outside of a courtroom since the deployments began and comes a day after the president faced another legal setback over his muscular use of troops in larger federal opera

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