WASHINGTON -- House Speaker Mike Johnson is calling on Ukrainian President Volodymyr Zelenskyy to fire his country's ambassador to the U.S. as Republicans criticize Zelenskyy's visit to an ammunition plant in Pennsylvania, a swing-state, as a political stunt. The Republican speaker's demand Wednesday came as Zelenskyy addressed the United Nations in New York on the eve of his visit Washington, where he has plans to brief lawmakers on Capitol Hill... Rep. James Comer, the Republican chairman of the House Oversight Committee, announced Wednesday he was opening an investigation into whether the Biden-Harris administration used taxpayer-funded resources to fly Zelenskyy to...