WASHINGTON, DC - SEPTEMBER 08: Members of the United Mine Workers of America bow their heads in prayer during a rally on Capitol Hill September 8, 2016 in Washington, DC. The union and its supporters in Congress say the federal government should honor a 1947 promise to provide for the pension and healthcare benefits of retired miners. About 100 protesters from the UMWA were arrested for blocking traffic on Pennslylvania Avenue following the rally. (Photo by Chip Somodevilla/Getty Images)