Democrats on the House Oversight Committee blocked a Republican-backed subpoena to compel Hunter Biden to testify as a witness. “Democrats just denied our motion to subpoena Hunter Biden,” the GOP members of the committee wrote on Twitter. “They refuse to hold Hunter accountable for his shady business dealings that make us more dependent on China for renewable energy. It’s past time for accountability.” Rep. Andy Biggs (R-Ariz.) made a motion to subpoena President Joe Biden’s son as a witness at its hearing about making all U.S. Postal Service (USPS) vehicles electric. “I just made a motion to subpoena Hunter Biden as a witness for the House Oversight and Reform Committee’s hearing on electrifying [the USPS],” Biggs wrote on Twitter. “Hunter sold a U.S. cobalt mine to a Chinese company. Cobalt is necessary for electric car production. Hunter’s expertise is invaluable!” Last week, House Republicans on the Oversight and Reform Committee called …