This week, both U.S. And Mexican officials are trying to iron out a deal to prevent those tariffs from going into effect.
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Still, White House spokeswoman Sarah Sanders said the President's decision remains unchanged.
In an interview with CNN prior to the talks, White House trade adviser Peter Navarro said the threatened tariffs against Mexican goods "may not have to go into effect" if the country can take necessary measures to halt undocumented migrants crossing the southern USA border.
Mexican President Andres Manuel Lopez Obrador said Thursday he will soon travel to the border city of Tijuana to "defend the dignity" of his nation in the face of U.S. tariff threats, as talks were set to resume in Washington.
Vice President Pence, who led Wednesday's talks, said the two sides had "a good discussion".
He added that it would be "for the president to decide" whether Mexico was doing enough to head off the tariffs.
The tariffs would begin on June 10 and would gradually rise to 25% by October if there was no deal, Trump said.
Brad Parscale, Trump's 2020 campaign manager, tweeted on Thursday: "Mexico sent representatives to Washington as soon as President @realDonaldTrump announced possible tariffs".More news: Craig Kimbrel Has Reportedly Made His Free Agency Decision
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"The US position is focused on migrant control measures, ours is on development", he said, referring to Mexico's support of a broader effort to support the economies of Honduras, El Salvador and Guatemala.
The Trump administration has demanded Mexico take tough action to halt the flow of hundreds of thousands of Central American migrants towards the United States, insisting it lock down its border with Guatemala to the south and agree to let asylum seekers register their claims inside Mexico.
Mexican officials have prepared a list of US products that may face retaliatory tariffs if talks do not end in agreement.
"They are told by smugglers, they are hearing announcements in their own country, that if they come right now and bring a child, they will be released", she told CNN on Thursday. On Thursday, Mexico said it would deploy 6,000 troops to its southern border to repel migrants.
Mexican Foreign Secretary Marcelo Ebrard spent several hours at the State Department Thursday morning, while Trump's legal counsel and other Mexican aides met at the White House Thursday afternoon.
The Mexican and US officials described the accord's framework on the condition of anonymity, citing the sensitivity of the global negotiations, but they expressed optimism that the deal was attainable. A sudden shift to tariffs on "all" Mexican products, as Trump has threatened, would overwhelm the companies that move imports through US customs checks, according to Eduardo Acosta, vice president of R.L. Jones Customhouse Brokers in San Diego.
Tony Wayne, a former US ambassador to Mexico, said the two sides could have a good meeting and reach a deal, but still not satisfy the "wild card" president.
Mr Pence is looking for a comprehensive suite of proposals from the visiting officials about stopping the flow of migrants from Central America, a White House official said. State and local police provided a security escort to the migrants as they walked along a highway leading from the border to the first major city in Mexico, Tapachula.
Trump's tariff threat against Mexico also has cast a cloud over the United States-Mexico-Canada Agreement, a trade deal that was meant to replace the North American Free Trade Agreement.