Fox said Wednesday he was sending the bill back to Congress for changes, just one day after his office had said he would sign into law the measure, which would have dropped criminal penalties for possession of small amounts of marijuana, cocaine, heroin and other drugs.
The president will ask for corrections "to make it absolutely clear in our country, the possession of drugs and their consumption are, and will continue to be, a criminal offense."
The White House applauded Fox's decision. Presidential spokesman Scott McClellan said U.S. officials had expressed concerns about decriminalizing drugs. "We welcome the steps that are being taken by President Fox," McClellan said Thursday.
San Diego, California Mayor Jerry Sanders, who had said earlier he was "appalled" by the bill because it could increase drug availability north of the border, also said he was pleased by Fox's decision.
"I'm glad that he's listened to the many voices opposing the bill and made changes that will make good enforcement and not legalize drugs," Sanders said. "We have been a partner with Mexico in fighting against illegal drugs, and this will only help in the long-term in that relationship."
San Diego is a short drive from the border town of Tijuana, Mexico.
Earlier Wednesday, U.S. Embassy spokeswoman Judith Bryan said that U.S. officials had "urged Mexican representatives to review the legislation urgently, to avoid the perception that drug use would be tolerated in Mexico, and to prevent drug tourism."
That was apparently a reference to concern that the measure could increase drug use by border visitors and U.S. students who flock to Mexico on vacation, the Ap reports.
Bryan said the U.S. government wants Mexico "to ensure that all persons found in possession of any quantity of illegal drugs be prosecuted or be sent into mandatory drug treatment programs."
Fox's statement did not mention the U.S. criticism, but did acknowledge that the bill had been controversial.
"With sensitivity toward the opinions expressed by various sectors of society, the administration has decided to suggest changes to the content of the bill," the statement said.
Presidential spokesman Ruben Aguilar said on Thursday that Fox had "in no way" yielded to U.S. pressure, but acknowledged that Mexico "took into account the observations of U.S. authorities."
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