GOP lawmakers may charge Democrat Rep. Ed Markey (Mass.) with violating House ethics rules for "intimidating a witness" who testified before his committee, officials tell The Hill. House GOP leaders and members of the Energy and Commerce Committee have not “ruled out the option” of forcing a vote in the lower chamber to investigate the possible ethics violations, accusing the senior Democrat “retaliating and bullying” a witness who appeared last Tuesday before Markey’s subcommittee on Energy and the Environment, where the CEO of a major energy company told members that the White House-backed cap-and-trade bill would do nothing to reduce...