The impeachment investigation into President
Donald Trump has thrust
Washington into a political crisis. In the four weeks since House Speaker
Nancy Pelosi, D-Calif., launched the investigation, Trump has taken steps that have drawn more criticism, not less, repeatedly testing the loyalty of his stalwart
Republican allies. Trump angered GOP leaders and U.S. allies by clearing the way for
Turkish attacks on Syrian Kurdish fighters, key
American partners in the fight against the
Islamic State group.