"If the Republican Senate Majority does not show backbone in standing up to President Trump on this abuse, and if it lets stand the administration's usurpation of Congressional prerogatives in the trade and foreign policy areas, that alone will reinforce the markets' correct perception that the world has become too uncertain for many investments," Posen noted.

Neil Bradley, executive vice president and chief policy officer at the U.S. Chamber of Commerce, said the chamber was exploring legal options to challenge U.S. tariffs on Mexican goods.

"We have no choice but to pursue every option available to push back," Bradley said, adding that these tariffs will be paid by American families and businesses without doing a thing to solve the very real problems at the border.

Tariffs Hurt the Heartland, a national campaign comprised of over 150 of America's largest trade organizations from across retail, tech, manufacturing and agriculture, also blasted the president's tariff decision.

"Using tariffs to address unrelated policy objectives sets a dangerous precedent while creating significant uncertainty for American employers who are living tweet-by-tweet while trying to plan their business," the groups said in a statement.

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