A senior figure linked to Mexican President Andres Manuel Lopez Obrador resigned in recent days in response to ongoing corruption investigations relating to his business activities prior to and during his time in office.

Those investigations will continue despite his resignation, Mexican authorities said.

Carlos Lomeli Bolaños, a superdelegate from the state of Jalisco in central Mexico sanctioned by the U.S. in 2008 over links to drug trafficking groups but delisted in 2012, faces seven separate investigations of corruption, said Irma Erendira Sandoval, head of the Secretariat of the Civil Service, the agency tasked with investigating Lomeli. 

The probes could be referred to the attorney general’s office for criminal investigation if sufficient evidence is found, said Sandoval.

Lomeli announced via social media on July 12 that he was stepping down, saying the “noise of politicking” was interfering with his official duties. Despite his 2012 delisting, Kharon found that Lomeli maintained business ties with an array of sanctioned actors in Mexico. 

The probes into Lomeli mark the latest twist in the anti-corruption drive launched by Lopez Obrador. But, in contrast to many of the ongoing investigations by Lopez Obrador’s government, Lomeli is an ally of Lopez Obrador’s and a member of his political party. 

Officials from the previous government, which was led by a rival party, have been the subject of increasing scrutiny by Lopez Obrador’s government: Earlier this month, Mexican prosecutors obtained a warrant for the arrest of Emilio Lozoya, the former head of state-owned gas company Pemex. Two former governors, a sitting Supreme Court justice and a senior judge are also under investigation.

Lomeli was a businessman in Jalisco who reportedly helped divert methamphetamine precursor materials to the Amezcua Contreras Organization, the Treasury said in 2008 when imposing sanctions on him and Lomedic, S.A. de C.V., a natural health products company linked to him. Lomedic was also delisted in January 2012.