THE NUTSHELL VERSION:

A transcript released by the White House of Trump's July 25 call with Ukraine President Volodymyr Zelenskiy showed Trump asking a "favor" of the foreign leader and pushing him to launch an investigation into the Biden family. Hunter Biden was on the board of a Ukraine energy company while his father Vice President Biden led policy on Ukraine during the Obama administration, leading some to question whether there was a conflict of interest or impropriety.

"There's a lot of talk about Biden's son," Trump told Zelenskiy at one point, offering the assistance of his attorney general. He later adds "a lot of people want to find out about that so whatever you can do with the attorney general would be great."

Text messages later obtained by Congress showed top U.S. diplomats dangling the possibility of a summit of the two leaders in Washington on the condition that Ukraine agrees to announce an investigation. The Ukraine government never did. The text messages were provided in congressional testimony last week by one of the diplomats, Kurt Volker, who has since resigned.

It is illegal for anyone to receive something of value from a foreign national in connection with a U.S. election, according to the Federal Election Commission. While it is not immediately clear whether Trump or other U.S. officials broke the law in its handling of Ukraine, that might not matter. The Constitution allows for Congress to decide what constitutes an impeachable offense.

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