Mexican President Andres Manuel Lopez Obrador wrote a letter to U.S. House Speaker Nancy Pelosi,asking for a prompt approval of the new trade deal negotiated between Mexico, Canada and the United States, he said in a news conference on Monday.

Lopez Obrador hopes next politics won’t interfere with congress ratifying the U.S.-Mexico-Canada Trade Agreement, as candidates move forward in campaigning for next year’s elections, he said.

“The trade deal shouldn't get entangled with electoral politics,” Lopez Obrador said in the news conference.

Mexican legislators ratified the agreement in June. Neither U.S. nor Canada lawmakers have ratified it. It would replace the North American Free Trade Agreement, which has been in effect since 1994.

Congressional Democrats are asking for further protection for Mexican trade unions under the agreement, Lopez Obrador said. He added that Mexican lawmakers approved legislation with those purposes earlier this year.