Trump made the threat last week, saying that the tariffs would rise by five percentage points each month to a high of 25 percent if the southern United States neighbor fails to halt the northward flow of migrants.
"If the president does declare a national emergency and attempt to put these tariffs into place, I will introduce a resolution of disapproval to stop his overreach", Ways and Means chairman Richard Neal, a Democrat, said in a statement calling the Republican president's planned action "an abuse of power".
Mexico and the US will continue talks Friday about efforts to curb the flow of Central American migrants to the southern USA border, Mexican Foreign Secretary Marcelo Ebrard said in a short statement late Thursday.
Both Texas senators-Ted Cruz, who has voted in line with Trump's policy positions 91.8 percent of the time, and John Cornyn, who did so 94.8 percent of the time-also expressed concerns about Trump's proposed tariffs.
With U.S. companies already footing the costs of escalating trade tensions between Washington and Beijing, tariffs on Mexico would create an additional financial burden for American businesses.
Trump administration officials will meet for second day of talks with Mexico's foreign minister in Washington on Thursday. Sanders had said earlier that the two sides had "made a lot of progress" but not enough.
"The stance of the United States is focused on measures of migratory control, ours on development", he said.
Sen. Rand Paul, R-Kentucky, said in television interviews this week that he opposes the tariffs as "simply a tax on the American people" and warned that there could be enough Republican critics to block them.
Lord Digby Jones: Corbyn 'disgraceful and embarrassing' over anti-Trump speech
Trump was asked a question about the opposition Labour Party leader Jeremy Corbyn, who was addressing protesters outside . Trump calls the protests against him " fake news ". "Perhaps you won't be given the credit you deserve", Trump told May.
Vice President Mike Pence's Chief of Staff Marc Short, center, speaks to reporters outside the West Wing of the White House in Washington, Wednesday, May 29, 2019.
Since the talks began on Wednesday, Mexico has offered small and so far undisclosed concessions; the USA demanded major action, according to The Associated Press.
President Donald Trump and first lady Melania Trump board Air Force One as they depart Shannon global airport en route to Washington, in Shannon, Ireland June 7, 2019.
It was unclear whether the hardening of Mexico's response would appease Trump, who is struggling to make good on his key 2016 presidential campaign promise to build a wall along the U.S. -Mexico border as part of a hard-line immigration stance.
Mexico has long resisted that request. "Additionally, Mexico has reportedly agreed to a major overhaul of reasonable asylum protocols, which would require asylum applicants to seek permanent refuge in the first country they arrive in after fleeing their home countries", adds the article. Those people worry about the negative economic consequences for Americans and believe the tariffs - which would likely spark retaliatory taxes on US exports - would also hurt the administration politically.
All of which is to say: Mexico had a wide variety of reasons to believe that Trump would ultimately back down. The officials were not authorized to discuss the matter publicly and spoke on condition of anonymity.
Underscoring the scope of the border problem, the Department of Homeland Security announced separately that U.S. Border Patrol apprehensions of migrants illegally crossing the border hit the highest level in more than a decade in May.
'Despite some progress in talks, the Mexico tariffs are set to go into effect, ' the White House said Friday.