Deal negotiations between Exxon and Pioneer are advanced but have not yet led to an agreement, Reuters reported on Thursday. These transactions were eventually allowed to be completed, and the regulator has not sued to thwart an oil and gas production deal since 2000. The lawyers and experts interviewed said the FTC would face an uphill struggle in challenging Exxon's attempted acquisition of Pioneer. "The modern U.S. experience is that oil and gas deals of any notable size get a close look. It sued to block the merger and only agreed to drop its objections after BP offered to divest oil production acreage in Alaska.

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