Washington, Oct. 20 -- The impeachment investigation into President Donald Trump has thrust Washington into a political crisis. And Trump keeps adding to the chaos.

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. His actions have both intensified the questions at the center of the inquiry and opened new areas of concern.

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. He brazenly announced plans to hold next year's Group of Seven summit at ...