White House and congressional leaders are eyeing several responses to protect U.S. consumers, ranging from an effort to wrest market control away from OPEC, limiting U.S. companies’ energy exports, and easing sanctions on unfriendly oil-producing nations — each of which carries serious potential downsides for American interests. For now, the White House is pledging to work with Congress on a bill to allow the U.S. to sue oil cartels for antitrust violations... The so-called NOPEC bill — No Oil Producing and Exporting Cartels — would change antitrust laws to allow the Justice Department to sue nations that restrain trade in...