The House GOP on Wednesday formalized its impeachment inquiry into President Biden with a House vote, a step Republicans hope will add legal weight to their demands as the probe moves into a more aggressive end stage.

Earlier in the day, Hunter Biden — the president's son who is at the center of many of the lines of inquiry — defied a GOP subpoena to appear for a deposition on Wednesday morning. Republicans leading the probe said that his refusal "reinforces the need for a formal vote."