What Mattered Today: December 18, 2019

House lawmakers debated whether to impeach President Trump ahead of expected final votes on the matter this evening. Plus, a federal appeals court ruled the Affordable Care Act’s individual mandate was unconstitutional, and Justice Department inspector general Michael Horowitz said he found no evidence of Trump Tower surveillance. Read up on these and more of today’s top headlines.

What Mattered Today: December 18, 2019

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