The court-authorized search of former President Donald Trump’s Mar-a-Lago estate is another unmistakable signal that the Justice Department is trying to build a criminal case against him arising out of the Capitol riot. Ostensibly, the search relates to a long simmering dispute between the former president and the government over Trump’s potentially illegal retention and mishandling of classified information. But don’t be deceived. National Archives officials alerted the Justice Department months ago regarding missing records and possible classified information violations. That owes to the chaotic atmosphere in which the Trump family decamped to Florida from the White House following the...