The John Williams NewsClick: Witnesses in the impeachment trial

Former National security adviser John Bolton waves as he leaves his home in Bethesda, Md. Tuesday, Jan. 28, 2020. President Donald Trump's legal team is raising a broad-based attack on the impeachment case against him even as it mostly brushes past allegations in a new book that could undercut a key defense argument at the Senate trial. Former national security adviser John Bolton writes in a manuscript that Trump wanted to withhold military aid from Ukraine until it committed to helping with investigations into Democratic rival Joe Biden. (AP Photo/Luis M. Alvarez)

Notice: you are using an outdated browser. Microsoft does not recommend using IE as your default browser. Some features on this website, like video and images, might not work properly. For the best experience, please upgrade your browser.