For nearly three months, Trump has fought the impeachment inquiry at every turn, blocking witness testimony, denying documents and complaining on Twitter that no president has ever suffered such mistreatment at the hands of his political enemies. But congressional investigators have pushed inexorably toward the scene expected to play out on the House floor on Wednesday evening when members will vote on charges that Trump abused the powers of his office and obstructed Congress in service of a Ukraine scheme meant to harm a political rival, former vice-president Joe Biden. The...