The nation’s largest Latino advocacy group says it invited every presidential candidate to annual convention next week. Two Democrats, but not a single Republican, plan to attend, a spokesman said.

Democrats Hillary Clinton, the former secretary of state, and Martin O’Malley, former governor of Maryland, will appear at a lunch Monday in Kansas City, Mo., before the National Council of La Raza, an advocacy and civil rights organization for Latinos. The group has been a vocal backer of a path to citizenship for people in the U.S. illegally and other changes to the immigration system.