Speaker Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.) hammered President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Saturday over his latest threats to slap a 5 percent tariff on imports from Mexico, repeating her claim that the president was negotiating via "threats and temper tantrums."

In a statement, Pelosi denounced Trump's relationship with Mexico, accusing him of taking actions that "undermined America's preeminent leadership role in the world" by threatening tariffs on a country she described as "our close friend and neighbor to the south."

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"The Trump Administration must also do much more to cooperate in a meaningful way with Mexico in cracking down on smuggling networks. [Its] failure to do so thus far is unconscionable and irresponsible. Threats and temper tantrums are no way to negotiate foreign policy," she added.

Trump also took aim at Pelosi on Saturday morning on Twitter, calling her "nervous."

"Nervous Nancy Pelosi & the Democrat House are getting nothing done. Perhaps they could lead the way with the USMCA, the spectacular & very popular new Trade Deal that replaces NAFTA, the worst Trade Deal in the history of the U.S.A. Great for our Farmers, Manufacturers & Unions!" Trump tweeted.

The comments come amid an intensifying feud between Pelosi and Trump. The president lashed out at the speaker after reports surfaced that she told other Democrats she wants to see him "in prison."

“Nervous Nancy Pelosi is a disgrace to herself and her family for having made such a disgusting statement, especially since I was with foreign leaders overseas. There is no evidence for such a thing to have been said,” Trump tweeted Friday.

Saturday's back-and-forth came after Trump had threatened to levy tariffs against Mexico beginning Monday if the government did not ramp up its efforts to curtail illegal border crossings into the U.S. However, Trump announced late Friday that a deal had been reached to avoid the tariffs.

As part of the deal, Mexico will beef up its national guard presence at its southern border to stem the flow of Central American migrants northward, boost intelligence sharing with the U.S. and allow the U.S. to deport migrants seeking asylum to Mexico to await adjudication. Mexico also said it would take stronger action against human and drug trafficking rings.