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Lopez Obrador, who met with US lawmkers this week, said he did want to there to be any motive for the United States to reopen negotiations of the pact, which wound up last year.
Pelosi on Tuesday said the US House of Representatives could not take up the deal, known as USMCA, until Mexico passes legislation protecting workers.
Members of the labor committee in the Mexican Congress have said they plan to pass legislation by the end of this month that would make it easier for workers to form independent unions.