Prosecutors in Mexico have launched a corruption investigation against former President Enrique Peña Nieto.
It happened after Emilio Lozoya, a former head of the state energy company, accused Mr. Peña Nieto of accepting bribes of millions of dollars and bribing MPs.
Mr. Lozoya was extradited from Spain last month to appear in court over allegations of corruption involving Brazilian construction giant Odebrecht.
Mr. Peña Nieto, who took office in 2012-18, has not made any comment so far.
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Last year, a witness testifying at the trial of Mexican drug dealer Joaquín “El Chapo” Guzmán said that Peña Nieto had accepted a bribe of $ 100 million (£ 77 million) from the robber.
The former president also did not comment on the allegations, but he has previously denied the corruption allegations.
What did Emilio Lozoya say?
Mr. Lozoya was a former senior official in Peña Nieto’s 2012 campaign and head of state oil and gas giant Pemex from 2012 to 2016.
Mr Lozoya said Peña Nieto and former Finance Minister Luis Videgaray ordered him to put more than $ 4 million in bribes from Odebrecht into the 2012 presidential campaign.
In the second charge, Mr. Lozoya said that in power, Mr. Peña Nieto and Mr. Videgaray used a similar amount to bribe lawmakers to secure passage of a key energy reform bill. Congress.
Mr. Lozoya said he could bring four witnesses, as well as video and other documents, to prove his charges.
Mr. Lozoya is one of the most powerful figures in Mexico when he is a presidential adviser.
Neither Mr. Peña Nieto nor Mr. Videgaray commented on specific charges against them. They have not been charged with anything.
However, Mexican Justice Minister Alejandro Gertz considers this testimony important enough to open an investigation into the matter.
In the past, no former president in Mexico had to go to jail despite governments repeatedly being stained by rampant corruption, BBC Mexico correspondent Will Grant said.
Incumbent President Andrés Manuel López Obrador earlier said he did not support making charges against his predecessor – but would delay any decision by the attorney general.