efe-epaMexico City

Mexico's president on Tuesday unveiled and signed an initiative for a referendum on whether his predecessors should be investigated and potentially put on trial for corruption.

Andres Manuel Lopez Obrador decided to send that initiative to the Senate because a signature-gathering drive is running out of time to obtain the required total of 1.6 million.

"The information I have is that they're going to have the required (number of) signatures today, that the signatures are now being organized and that they now have close to 2 million citizen signatures. In any case, since the deadline expires today, I thought it was important to present this document as well so there's more certainty," the president said in his regular daily news conference at Mexico City's National Palace.