Former national security adviser John Bolton cautioned about the influence Rudy Giuliani had on US-Ukraine policymaking during a meeting in mid-June with top US officials, a career foreign service officer plans to tell Congress on Wednesday, according to a copy of his opening statement obtained by CNN.

Christopher Anderson, who was former special envoy for Ukraine Kurt Volker‘s assistant from 2017-2019, is one of two State Department officials set to testify behind closed doors as part of the House Ukraine impeachment inquiry on Wednesday. Catherine Croft, who took over that role in the summer of 2019, is also scheduled to testify.