President Donald J. Trump’s choice to lead the Environmental Protection Agency, Oklahoma Attorney General E. Scott Pruitt, cleared his first hurdle en route to Senate confirmation with an unusual one-party vote by the Environment and Public Works Committee — a vote boycotted by the committee’s Democrats. “Let me make clear to everyone what just happened,” said Sen. John A. Barrasso III (R.-Wyo.), the committee’s chairman. “Yesterday, the minority members of the committee chose to boycott our business meeting because they do not support the nomination of Scott Pruitt,” he said. “As we pointed out yesterday, elections have consequences and a...