LONDON — The Dutch chapter of the environmental activist group Greenpeace on Monday disclosed a trove of documents from the talks over a proposed trade deal between the European Union and the United States.

The documents, Greenpeace said, showed that American trade negotiators had pressed their European counterparts to loosen important environmental and consumer protections, along with other provisions.

But American and European trade officials, while not denying the validity of the materials, insisted on Monday that the documents — 248 pages, which Greenpeace said amounted to two-thirds of the latest negotiating text — merely represented negotiating positions, and that the criticisms were off base.

Still, the disclosures and criticisms are unlikely to speed the talks, which already seem to have little chance of making progress until after the United States elects its next president in November — if even then, given how rancorous foreign trade has become in the American political debate.