As alarming testimony and facts have continued to emerge about the former president’s efforts to overturn the election that he lost, Donald Ayer and Norman Eisen disagree with commentators who say there is “little reason” to open an investigation, write Donald Ayer and Norman Eisen. And should he choose to take up such a probe, Attorney General Merrick Garland’s lifetime of dedication to the even-handed, apolitical administration of justice, make clear that he is well matched to the challenge.