As House Democrats wrapped up the public impeachment hearings on Nov. 21, Senate Republicans sent the latest round of records requests as part of a growing inquiry into the Obama administration’s actions related to Burisma, the Ukrainian gas firm that hired Hunter Biden, the son of former Vice President Joe Biden.

Vice President Joe Biden, center, tours a Hutong alley with his son Hunter Biden, left, and granddaughter Finnegan Biden, right, during an official visit to Beijing, China, on Dec. 5, 2013. Andy Wong-Pool/Getty Images
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