Foreign business chambers have been warning for weeks that a proposed, sweeping overhaul of Mexico’s judiciary that would make judges stand for election, would endanger foreign investment in Mexico.

A sweeping change would have thousands of judges, from local courtrooms all the way up to the Supreme Court, elected instead of appointed.

All judges in Mexico will be elected by popular vote. Protesters within the country, trade partners the United States and Canada and investors have raised concerns over the controversial law.

Mexico's President Andres Manuel Lopez Obrador addresses the media in his daily press conference at the National Palace, after Mexico's Senate approved a judicial reform, in Mexico City, Mexico September 11,

Mexican President Andrés Manuel López Obrador signed a bill into law on Sunday that will require all federal judges, including those on the Supreme Court, to be elected by popular vote.

Going forward, Mexican voters will now elect judges at every level, dramatically restructuring the third branch of government.

Outgoing Mexican President Andrés Manuel López Obrador on Sunday signed an overhaul of the country's judicial system that critics warn will weaken democracy. Why it matters: López Obrador says the constitutional reform,

President Andres Manuel Lopez Obrador announced Sunday that he had signed into law controversial judicial reforms making Mexico the world's only country to elect all its judges by popular vote.