What is the fine-grained topic of the following text: A larger group of liberal Democrats—including close Pelosi allies George Miller (D-Calif.), Rosa DeLauro (D-Conn.) and Jan Schakowsky (D-Ill.)—last month demanded assurances from Obama that “Colombia’s long track record of repression, violence and murder of labor unionists has truly changed.” Obama subsequently hosted Colombian president Juan Manuel Santos at a cordial White House meeting to promote the trade agreement. Only return the topic.
U.S. Democrats demanding assurances from Obama about Colombia's human rights record in context of a trade agreement