House Speaker Nancy Pelosi has threatened to block the UK-US trade deal over tensions in Northern Ireland

THE third most powerful politician in the United States launches a scathing anti-Brexit blast against Britain over tensions in Northern Ireland.

House Speaker Nancy Pelosi vowed the US Congress would not back a free trade deal with Britain if the government persisted with “deeply worrying” plans to “unilaterally scrap” the Brexit trade terms signed in 2020.

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But her comments sparked a fierce backlash from Brexiteers and Unionists.

In a sharply worded intervention, Ms Pelosi called on the UK and EU to continue negotiations on the Northern Ireland Protocol to keep peace in the region.

The Congresswoman said in a statement: “The Good Friday Agreements are the bedrock of peace in Northern Ireland and a ray of hope for the whole world.

“Ensuring that there is no physical border between the Irish Republic and Northern Ireland is absolutely necessary to uphold this landmark agreement that transformed Northern Ireland.”

But former Brexit negotiator Lord Frost slammed the comments, saying it was protocol that risked peace in the promise.

The Tory peer invited Pelosi to visit Northern Ireland to see the negative impact of the extra controls and regulations.

The DUP called Ms Pelosis’ comments “completely unhelpful”.

Chairman Sir Jeffrey Donaldson added: “The problem for Speaker Pelosi is that there is no bipartisan or cross-community support for the protocol in Northern Ireland, it undermines the Belfast/Good Friday agreement, it undermines the political institutions that operate under these terms This agreement undermines the principle of consent.”