WASHINGTON—House committees have asked former national security adviser John Bolton to testify next week, as their impeachment probe puts an increasing focus on White House officials advising President Trump on Ukraine policy. Democratic lawmakers say that they want to hear from Mr. Bolton because he has become a central figure in their probe into Mr. Trump’s efforts to get Ukraine to begin investigations into the 2016 election and potential 2020 rival Joe Biden, an issue at the center of the impeachment probe.

Source: Wall Street Journal October 30, 2019 09:04 UTC