He originally belonged to the Institutional Revolutionary Party (PRI) but switched his allegiance to the National Regeneration Movement (Morena) in 2017.

[4] He served as the state secretary of social development in the administration of Governor Mario Marín (2005–2011).

[3] In the 2015 mid-term federal election he won a seat in the Chamber of Deputies for the PRI, representing Puebla's 7th district [es] (Tepeaca).

[1][3] On 28 April 2017, however, he resigned from the PRI's benches and, after 20 June 2017, sat with the National Regeneration Movement.

[5][6] Armenta Mier resigned his Senate seat on 1 March 2024[5] and ran for governor of Puebla in the 2 June 2024 election as the candidate of the Sigamos Haciendo Historia coalition.