The couple were killed on Monday in a helicopter crash in central Mexico.
The governor of Mexico's central Puebla state, Martha Erika Alonso, has died in an air crash, just days after being sworn into office.
The Puebla governor reportedly died in the crash, as did the pilot, co-pilot and a fifth passenger.
The aircraft carrying Puebla Gov Martha Erika Alonso and Sen Rafael Moreno Valle came down shortly after it took off. "I commit myself to investigate the reasons [of the crash], to tell the truth about what happened and to act accordingly", the president wrote on his Twitter blog. Both he and Alonso were members of the conservative National Action Party (Partido Accion Nacional, PAN).
Mr Moreno also served as governor between 2011 and 2017.
Security Minister Alfonso Durazo said the privately owned helicopter was bound for Mexico City and crashed after suffering an unspecified failure in the town of Santa Maria Coronango, about three nautical miles from Puebla airport.
President López Obrador's left-wing Morena party had challenged the validity of Ms Alonso's victory in July.
President Andrés Manuel López Obrador also confirmed the deaths on Twitter Monday evening.
There were accusations of election fraud, and an electoral tribunal had to validate the results months after the vote.
Puebla's parliament will now have to appoint an interim governor until new elections are held. My sympathies to their loved ones. No information about the cause of the crash is available at the moment.
A number of Mexican politicians have died in aircraft accidents in recent years, including federal interior ministers in 2008 and 2011.
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