John Bolton Says He Will Testify Before The Senate If He's Subpoenaed

The transcript discusses John Bolton's potential testimony in the Senate impeachment trial, focusing on his concerns about a meeting between President Trump and Ukrainian President Zelinsky, his views on Rudy Giuliani's involvement in Ukraine, and the handling of classified memos and military aid. Fiona Hill's testimony is also highlighted, revealing Bolton's disapproval of certain actions and his communication with the National Security Council.

What were the reasons multiple witnesses provided for the withholding of Ukrainian military aid?

How might Bolton's testimony impact the understanding of the decisions made regarding the Ukrainian military aid?