The speaker said Tuesday that she had warned Prime Minister Theresa May, Conservative pro-Brexit hard-liners and Labour leader Jeremy Corbyn that if the churn of Britain’s messy break with the European Union in any way weakens the Northern Ireland peace pact known as the Belfast or Good Friday Agreement, the U.S. Congress will block any trade deals Britain might seek with the United States.

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“Don’t even think about that,” Pelosi said she had warned. “We made it clear to all that if there were any harm to Good Friday accords, no treaty.”

Pelosi did not have to remind her hosts that the Trump administration can negotiate treaties and trade deals. But she emphasized that Congress has to approve them.

Speaking at the London School of Economics on Monday night ahead of her visit to Dublin on Tuesday, Pelosi also told Brexiteers that the 1998 Irish peace agreement was dear to Americans. The accord ended 30 years of sectarian strife, known as “the Troubles,” that left 3,500 soldiers, police officers and civilians dead.

In remarks Tuesday in Dublin, Pelosi stayed on message, warning that a trade deal between the United States and Britain was “just not in the cards” if Brexit caused any damage to the peace process.

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“This isn’t for us an issue or an agreement. It is a value,” she told an audience that included Irish Foreign Minister Simon Coveney.

Pelosi’s remarks served to bolster demands by the E.U. that any agreement allowing for Britain’s orderly departure from the bloc must guarantee that the border between Northern Ireland, a part of the United Kingdom, and the Republic of Ireland, a member state of the E.U., remains as it is now — open and virtually invisible.

This guarantee, known as “the backstop,” would hold no matter what happens in future negotiations over customs duties, trade tariffs and immigration controls.

May has stressed that her government will comply and that, as a signatory to the Good Friday Agreement, it wants to do nothing to undermine it. But Brexiteers in her party and government have balked, arguing that the backstop could shackle Britain to the E.U.’s rules, perhaps forever.

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May’s Brexit deal has been voted down three times in the House of Commons, with the Irish border guarantee looming large each time.

In London, Pelosi stressed that getting a trade bill through Congress is “no given” at any time. But “if there were to be any weakening of the Good Friday accords,” she added, “there would be no chance whatsoever, a nonstarter, for a U.S.-U.K. trade agreement.”

“The Good Friday accords ended, like, 700 years of conflict,” Pelosi said, noting that it was President Bill Clinton and former senator George Mitchell who brokered the deal.