House Democrats leading the impeachment inquiry are focused on a July 25 phone call in which Trump asks Zelenskiy to investigate Democratic rival Joe Biden's family. Trump tweets Tuesday the April call is "more important."
Trump had suggested he would release the April transcript Tuesday. Trump has kept up a steady stream of tweets about what he calls the impeachment "witch hunt." Among his events this week is a high-profile meeting with Turkey's President Recep Tayyip Erdogan on Wednesday, the day impeachment hearings open.