Mexico is redoubling its efforts to reach a NAFTA agreement with the U.S. and Canada by the end of August to increase certainty for investors and take the heat off incoming President Andres Manuel Lopez Obrador, according to three people familiar with the negotiations.

President Donald Trump’s push for a quick resolution to NAFTA talks is being stymied by persistent differences among the United States, Canada and Mexico over a handful of the make-or-break issues.

The Trump administration is pushing for a preliminary NAFTA deal to announce at a summit in Peru next week, and will host cabinet ministers in Washington to try to achieve a breakthrough, according to three people familiar with the talks.