(Adds detail on Friday talks, comment by Trudeau)
By Sharay Angulo and Timothy Aeppel
WASHINGTON, Aug 23 (Reuters) - U.S.-Mexico talks to craft a deal on new auto industry rules under the NAFTA trade pact are poised to continue into next week, Mexico's economy minister said on Thursday, as friction persists over the threat of more restrictive U.S. import rules.
Since restarting last month, talks have focused on settling differences between the two sides over U.S. President Donald Trump's complaint that the North American Free Trade Agreement has undercut U.S. manufacturing to Mexico's benefit.
Trump has threatened to withdraw from the 24-year-old trade pact between the United States, Mexico and Canada if it is not reworked to the advantage of U.S. workers.
He hopes to reduce the U.S. trade deficit with lower-cost Mexico and claw back jobs, particularly in the auto industry.
"We're on a path that can take us into the weekend and next week," Mexican Economy Minister Ildefonso Guajardo told reporters as he entered the offices of U.S. Trade Representative Robert Lighthizer in Washington for talks on Thursday afternoon.
Mexico and the United States have said they were close to resolving remaining bilateral issues in the revamp of the trade pact. However, a day earlier Guajardo had said the two sides might be able to reach agreement in "hours."
The tone has become more cautious since then.
"We are well advanced (but) not there yet," said Guajardo.
Leaving the talks with Guajardo later in the afternoon, Mexican Foreign Minister Luis Videgaray said discussions would begin again on Friday at 9.30 a.m. local time in Washington.
The talks could drag on due to unresolved sticking points, such as rules of origin for autos, meant to bring more production to the region, a U.S. sunset proposal that could kill NAFTA after five years and dispute resolution mechanisms.
Canada has been waiting for the Mexican and U.S. teams to reach common ground before rejoining the negotiations.
TARIFF DISPUTE
The Trump administration wants to be able to impose national security tariffs on future Mexican output from new auto assembly and parts plants, auto industry officials say.
That demand has been causing friction at the latest U.S.-Mexico talks, according to an industry source familiar with the process, who spoke on condition of anonymity.
Matt Blunt, president of the American Automotive Policy Council, also said there had been discussion of imported products that do not comply with new NAFTA requirements.
"We've not really been making any recommendations to the U.S. government on that topic," he told reporters on a conference call.