evidence: I arrived in Westminster a few hours later. Climate protesters had blocked streets around Parliament Square, making it still and desolate. I met Nigel Dodds, the Parliamentary leader of the Democratic Unionist Party, in his office, next to the House of Commons. We sat by a brown-tiled fireplace, under a large portrait of Winston Churchill. The D.U.P. is one of the most hard-line pro-unionist parties in Northern Irish politics. It opposed the Good Friday Agreement, for the concessions that it made to Irish nationalists, and was the only party in the territory to campaign for Brexit. Since 2017, the ten M.P.s of the D.U.P. have been nominal allies of the Conservatives in Parliament, but they broke with May and worked closely with the E.R.G. to defeat her deal.