Why did President Trump release aid to Ukraine on Sept. 11 after holding it up for 55 days? Democrats and Republicans have been fighting over the answer throughout the impeachment debate.

Democrats and their allies in the media contend Trump freed up the aid only after the White House learned that a whistleblower had filed a complaint against the president. “The reason the aid was produced was that the whistleblower had come forward at that point,” CNN’s Jeffrey Toobin said Tuesday. “Basically, the Trump administration was busted. They got caught, and that’s the reason they released the money.”