9 AM ET: Columbia in crisis, mass grave toll, distant space probe & more

Columbia University is facing pressure over the arrests of student protestors as well threats against Jewish students. More bodies have been found in a mass grave in Gaza, taking the total to 310. Former President Donald Trump is facing a hearing over possible violations of a gag order. We'll tell you want to look out for in the Pennsylvania primaries. Plus, a space probe 12 billion miles away has started sending data back to Earth again.

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