But Trump declared it was "not almost enough" to halt the import taxes he is holding out as a way to force Mexico to stanch the flow of illegal migrants at America's southern border. A senior administration official said the US once again pressed Mexico to step up enforcement on its southern border and to enter into a "safe third country agreement" that would make it hard for those who enter Mexico from other countries to claim asylum in the U.S.
Mr. Trump has called the tariffs "beautiful", but he also repeatedly misstates how tariffs work, erroneously insisting that China and Mexico are paying the tariffs.
Mexican Foreign Minister Marcelo Ebrard held meetings with US officials at the State Department, while other negotiators from both countries met at the White House. "I'm not anxious about it because they need us, we don't need them", he said. "I think we are advancing".
In the southern state of Chiapas, AFP journalists reported an increased police and military presence on roads typically used by migrants heading north. Ebrard confirmed that 6,000 National Guardsmen would be deployed to the border.
Trump officials have said Mexico can prevent the tariffs by securing its southern border with Guatemala, cracking down on criminal smuggling organizations and overhauling its asylum system.
The proposal would also allow the United States to deport Guatemalan asylum seekers to Mexico and Honduran and Salvadoran asylum seekers to Guatemala.
President Donald Trump greets Senator Ted Cruz while visiting a volunteer center packing emergency supplies for residents impacted by Hurricane Harvey on September 2, 2017, in Pearland, Texas.
"If we are able to make the deal with Mexico, & there is a good chance that we will, they will begin purchasing Farm & Agricultural products at very high levels, starting immediately", the president tweeted from aboard Air Force One on Friday. "The higher the Tariffs go, the higher the number of companies that will move back to the US!"
"There's a legal notification that goes forward today with a plan to implement tariffs on Monday, but I think there is the ability, if negotiations continue to go well, for the President to turn that off at some point over the weekend", Short said Friday morning.
"We have been working this afternoon, we still do not have an agreement", Ebrard said Thursday as talks wrapped for the day.
The new Mexican government under President Andres Manuel Lopez Obrador had resisted United States pressure to control migrants moving across its territory towards the U.S., but in recent weeks has started to restrict visas and deport people back into Guatemala.
"It's a good sign that talks have not broken down", Lopez Obrador told reporters in Mexico City.
Trump is facing pressure from Congress to move away from tariffs because of the impact they could have on the USA economy. It was the highest monthly figure in 13 years.
Mexico has prepared a list of possible retaliatory tariffs targeting US products from agricultural and industrial states regarded as Trump's electoral base, a tactic China has also used with an eye toward the Republican president's 2020 re-election bid. But so far, the tariffs alone on Chinese imports are adding costs of $831 for the average family in the USA, according to economists at the New York Federal Reserve.
Beyond Trump and several White House advisers, few in the administration believe imposing tariffs is a good idea, according to officials familiar with internal deliberations.