NEW YORK, July 22 (UPI) -- The New York Times commented editorially Monday on Mexico's political and economic challenges: Mexico, battered by corruption scandals, deep recession and mysterious guerrilla violence, is passing through difficult and dangerous times. But instead of stepping up to the challenge with a bold plan of action, President Ernesto Zedillo now appears to be retreating from the promises of open, honest government he made at the start of his term 20 months ago. That is exactly the wrong response. The repeated political and economic shocks of the last two and a half years have shaken the confidence of Mexico's political and business elite. The latest blow has come from Swiss and American judicial inquiries into huge secret bank accounts maintained by Raul Salinas de Gortari, the brother of former President Carlos Salinas de Gortari. Many Mexicans suspect that these accounts may have been used to park payoff money from major businesses and even drug cartels. What connection, if any, Carlos Salinas may have had with any illegal activity is unclear, but a serious public investigation by Mexican authorities is warranted. These revelations, combined with the prolonged economic slump and rural violence, have shaken the legitimacy of Mexico's long-entrenched political system. That system has delivered nearly 70 years of relative political stability, but at the price of letting top officials operate above the law and avoid prosecution for serious misconduct. The United States has an enormous interest in the outcome of Mexico's current crisis. Two peoples deeply entwined by history, geography and large-scale migration have been drawn even closer by the North American Free Trade Agreement. Washington must respond sensitively to the Mexican crisis, respecting Mexico's sovereignty, the authority of its democratically elected government and the right of its people to sort out their own political destiny. But respond it must. The Clinton administration, still nursing bruises from its battles to win approval for NAFTA and last year's emergency bailout loan, would just as soon pretend all is well in Mexico, at least until November's election. The wiser course would be to encourage Zedillo to push through desperately needed political and judicial reforms. Specifically, Zedillo needs to distance himself from his party's corrupt and authoritarian old guard and insist on aggressive prosecution of compromised officials, no matter how politically well-connected they might be. Instead, Zedillo seems to be moving in the opposite direction. Last week, his supporters abruptly cut off a congressional investigation that focused on a questionable government payment seven years ago to a business owned by a political backer of Carlos Salinas. The inquiry was uncomfortable for Zedillo, who, as a budget official in the Salinas government, approved the payment. Zedillo also seems to have backed away from his efforts to clean up Mexico's notoriously fraudulent state elections. The most closely watched case involved the oil-rich state of Tabasco, where federal investigators found Gov. Robert Madrazo, an old-guard stalwart of the ruling party, had spent more than 30 times the legal limit in his 1994 campaign. Last month, Zedillo's attorney general filed criminal fraud charges but left it up to Madrazo's own state officials to prosecute. A few weeks later, Zedillo flew to Tabasco, embraced Madrazo on the airport tarmac, and all charges were dropped. Zedillo began on the right tack when he tried to bring new fairness to Mexico's judicial and electoral systems. By backing down now, he may buy a few months of political respite from worried members of his party's old guard. But he greatly heightens the risk of more radical challenges to the system, with disastrous consequences for his presidency and serious repercussions for the United States.