Senator Joe Manchin III of West Virginia has secured a promise from Democratic leaders and the White House to complete a highly contested 304-mile gas pipeline in his state, his office said, a major concession won as part of negotiations over a climate and tax bill. Mr. Manchin, who clinched a surprise agreement last week among Democrats to pass landmark climate legislation, made easing permits for energy projects a requirement of the deal. On Monday, his office made public details of the side agreement he struck with Senator Chuck Schumer of New York, the Democratic majority leader, House Speaker Nancy Pelosi and President Biden.

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