Meeting face-to-face with Mexican President Felipe Calderon, President Obama on Thursday said the U.S. is to blame for much of Mexico’s drug violence, and he set up a major congressional gun-control battle by calling on the Senate to ratify a treaty designed to track and cut the flow of guns to other countries.

Mr. Obama said he wants to renew a ban on some semiautomatic weapons but that it is not likely to pass Congress. Instead, he called for the Senate to ratify a decade-old hemispherewide treaty that would require nations to mark all weapons produced in the country and track them to make sure no weapons were exported to countries where they were banned.

“I will not pretend that this is Mexico’s responsibility alone. The demand for these drugs in the United States is what’s helping keep these cartels in business,” Mr. Obama said at a joint news conference with Mr. Calderon. “This war is being waged with guns purchased not here, but in the United States. More than 90 percent of the guns recovered in Mexico come from the United States, many from gun shops that line our shared border.”

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