The Foreign Secretary said she discussed the UK’s “cast-iron commitment” to the Good Friday Agreement during a meeting with US politicians.
Liz Truss said it was “great” welcoming a bipartisan US congressional delegation led by top Democrat Richard Neal, with topics of conversation ranging from the peace treaty to “the importance of free trade” and Russia’s invasion of Ukraine.
It comes amid heightened tensions over the post-Brexit deal on Northern Ireland.
Mr Neal, the head of the powerful ways and means committee in the US house of representatives, also spoke with International Trade Secretary Anne-Marie Trevelyan and Labour leader Sir Keir Starmer on Saturday.
Accounts of the talks with the Cabinet ministers have been thin on detail, with only tweets as a guide to their discussions.
The visit from the delegation follows a warning from US house speaker Nancy Pelosi that congress will not support a free trade agreement with the UK if the Government persists with “deeply concerning” plans to “unilaterally discard” the Northern Ireland Protocol.
Ms Truss said of her meeting: “Great welcoming RepRichardNeal WaysMeansCmte with members of US Congress today … We discussed our cast-iron commitment to the Belfast (Good Friday) Agreement, the importance of free trade and our condemnation of Russia’s illegal invasion of Ukraine.”
Ms Trevelyan said she was “delighted” to welcome the delegation to her department to discuss UK-US trade matters, as well as the situation in Ukraine, but made no explicit mention of post-Brexit tensions.
She tweeted: “Delighted to welcome RepRichardNeal RepKevinBrady and the US Ways & Means Committee delegation to tradegovuk to discuss trade, Ukraine, and watch the glorious rehearsals for Trooping the Colour #PlatinumJubilee”.
