Summary: Wednesday on the NewsHour, the Supreme Court agrees to hear arguments on whether Donald Trump is immune from prosecution in the 2020 election interference case. Republican Mitch McConnell announces he's stepping down from Senate leadership after 17 years at the helm. Plus, the results of Michigan's presidential primary and the warning signs they contain for leading candidates of both parties. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders
