Russia had also insisted on dropping a demand that the Syrian government withdraw its security forces from cities, but U.S. and European delegations refuse to include that change.
Led by Mr. Powell, the American delegation is to include Treasury Secretary John W. Snow and L. Paul Bremer III, the administrator of the American occupation.
Clinton also renewed her call to seat the delegations from Florida and Michigan and to include those delegates in the overall count for the nomination.
Sidney Crosby, Jonathan Toews, Ryan Miller and other outspoken, pro-union stars will be in New York, and the players' delegation is expected to include one or two big names.
The delegation is expected to include the directors of Germany's foreign and domestic intelligence services, who will expect to meet their counterparts, including the director of the NSA, General Keith Alexander, according to a source with knowledge of the trip.
The first directly relevant precedent was in 1990, when the first Bush administration claimed that Congress could not, as a condition of approving funds for a certain diplomatic delegation, require it to include a representative from a Congressional panel.
The delegation, which is to include Mayor Willie L. Brown Jr. of San Francisco, will express concerns about the business practices of companies like Enron, Reliant Energy and Mirant during California's energy crisis and how those practices will affect the long-term performance of their stocks, according to Philip Angelides, the state's treasurer and a Calpers board member.
Although unconfirmed, the U.S. delegation is expected to include Trump, Vice President Mike Pence, Secretary of State Mike Pompeo and Chief of Staff John Kelly, who will stay at the Shangri-La.
Earlier in the week, House leaders announced that they would not go to Geneva after unnamed White House sources were quoted as complaining about the size of the original delegation, which was to include up to 40 people.
