House Democrats are preparing to move their largely private impeachment inquiry onto a more public stage as soon as mid-November and are already grappling with how best to present the complex Ukraine saga to the American people.

Over the past three weeks, a parade of current and former Trump administration officials have testified behind closed doors, providing House investigators with a compelling narrative of President Trump’s campaign to extract political favors from Ukrainian officials. But on Wednesday, after conservative lawmakers stormed the hearing room and delayed the proceedings for five hours, some Democrats were feeling pressure to advance public hearings in hopes of avoiding further disruptions.

Among the witnesses Democrats hope to question in open session are the acting ambassador to Ukraine, William B. Taylor Jr., and his predecessor, former ambassador Marie Yovanovitch. Both are seasoned diplomats who, in earlier House testimony, effectively conveyed outrage over a White House plan to withhold much-needed military aid from Ukraine, a long-standing ally battling pro-Russian separatists.