US President Barack Obama will welcome four African leaders to Washington this month, the White House said. Obama on March 28 will meet with the president of Senegal, Macky Sall; of Sierra Leone, Ernest Bai Koroma; of Malawi, Joyce Banda; and the prime minister of Cape Verde, Jose Maria Pereira Neves. Spokesman Jay Carney said the leaders will discuss issues that include economic development and reinforcing democracy in sub-Saharan Africa. The multi-party meeting is not unprecedented: in late July 2011 Obama met with the presidents of Benin, Guinea, Nigeria and Ivory Coast. Obama, the son of a Kenyan-born father and a US-born mother, has visited sub-Saharan Africa only once as president -- he made a short trip to Ghana in July 2009.