NEW YORK, United States (AFP) — The United States and Mexico could move ahead without Canada in a new version of the North American Free Trade Agreement, US Trade Representative Robert Lighthizer said Tuesday, according to media reports. Momentum appeared to have stalled last week in efforts to bridge differences between Washington and Ottawa in negotiations to rewrite NAFTA, which began last year.Washington and Mexico City last month announced agreement on a new trade pact, but a separate track of intensive talks with Canada have so far failed to produce results.“There is still a . . .