WASHINGTON, DC - SEPTEMBER 08: Miners Protection Act sponsor Sen. Joe Manchin (D-WV) addresses thousands of members of the United Miner Workers of America as they gather for a rally on the National Mall September 8, 2016 in Washington, DC. About 100 protesters from the UMWA were arrested for blocking traffic on Pennslylvania Avenue following the rally. The union and its supporters in Congress say the federal government should pass the act and honor a 1947 promise to provide for the pension and healthcare benefits of retired miners. (Photo by Chip Somodevilla/Getty Images)