A Ukraine gas company tied to Joe Biden\'s son is at the center of the Trump-whistleblower scandal

Joe BidenVice President Joe Biden waves as he walks out of Air Force Two with his granddaughter Finnegan Biden and son Hunter Biden at the airport in Beijing December 4, 2013.Reuters

A Ukrainian gas company called Burisma Holdings is at the center of a complicated scandal involving a whistleblower complaint that's been linked to President Donald Trump, Ukraine, former Vice President Joe Biden, and his son Hunter Biden.

Here's what we know about the company and how it's involved in the back-and-forth between Trump and the Bidens.

Fast facts about Burisma Holdings:

What we know about Hunter Biden's role at Burisma:

Here's why this is now linked to a whistleblower complaint that's reportedly about Trump and a conversation with Ukraine's recently elected president:

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