WASHINGTON, DC - SEPTEMBER 08: United Mine Workers of America President Cecil Roberts (in blue) joins about 100 members of the UMWA as they block traffic on Pennsylvania Avenue near the U.S. Capitol following a rally on the National Mall September 8, 2016 in Washington, DC. The union and its supporters say Congress should pass the Miners Protection Act and honor a 1947 federal government promise to provide for the pension and healthcare benefits of retired miners. (Photo by Chip Somodevilla/Getty Images)

WASHINGTON, DC - SEPTEMBER 08: Thousands of members and supporters of the United Mine Workers of America gather to call on Congress to pass the Miners Proteciton Act during a rally on the National Mall 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)

WASHINGTON, DC - SEPTEMBER 08: Miners Protection Act sponsor Sen. Joe Manchin (D-WV) (C) talks with members of the United Miner Workers of America as they gather for a rally on the National Mall September 8, 2016 in Washington, DC. 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)

WASHINGTON, DC - SEPTEMBER 08: Miners Protection Act sponsor Sen. Joe Manchin (D-WV) greets members of the United Miner Workers of America as they gather for a rally on the National Mall September 8, 2016 in Washington, DC. 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)

WASHINGTON, DC - SEPTEMBER 08: Miners Protection Act sponsor Sen. Joe Manchin (D-WV) greets members of the United Miner Workers of America as they gather for a rally on the National Mall September 8, 2016 in Washington, DC. 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)

WASHINGTON, DC - SEPTEMBER 08: Sen. Shelley Moore Capito (R-WV) addresses thousands of members of the United Mine Workers of America as they gather for a rally on the National Mall September 8, 2016 in Washington, DC. The union and its supporters in Congress say the federal government should pass the Miners Protection Act and honor a 1947 promise to provide for the pension and healthcare benefits of retired miners. (Photo by Chip Somodevilla/Getty Images)

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)

WASHINGTON, DC - SEPTEMBER 08: Sen. Sherrod Brown (D-OH) 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. The union and its supporters in Congress say the federal government should pass the Miners Protection Act and honor a 1947 promise to provide for the pension and healthcare benefits of retired miners. (Photo by Chip Somodevilla/Getty Images)