House investigators seek Bolton’s testimony in impeachment inquiry

Democratic investigators have requested testimony from former national security adviser John Bolton in their expanding impeachment probe of President Trump, reaching into the upper echelons of the White House as they prepared to move ahead Thursday with a pivotal vote setting out the next stages of the inquiry.

Bolton, who left the White House amid acrimony with Trump last month, could offer direct testimony about the president’s alleged efforts to pressure Ukraine for dirt on political rivals in exchange for U.S. military aid and a meeting with the president. A...