Politics & Markets · Andean

—The result. Peru’s June 7 runoff ended in a near dead heat, with Roberto Sánchez and Keiko Fujimori separated by a sliver of the vote.

—The march. On Friday, June 19, the trailing candidate Sánchez is leading a protest in Lima he calls a defence of the vote.

—The challenge. His campaign says it is reviewing 744 polling-station tallies and pressing legal complaints over the count.

—The stakes. Peru is the world’s third-largest copper producer, so political turmoil there ripples into global metal markets.