A leading peace negotiator for Colombia's main rebel group is rejecting the government's insistence that talks wrap up by November, ahead of national elections.

Marco Leon Calarca says Colombian President Juan Manuel Santos should not put his personal ambition ahead of the peace process.

Calarca also tells The Associated Press that his Revolutionary Armed Forces of Colombia is hopeful the long negotiations will lead to peace. He says he is heartened that the two sides reached agreement this week on the first major point of dispute between them: land reform.

But Calarca also said in this week's interview that there could be no shortcuts and that the issues that remain are complicated and hard to resolve.