President Jimmy Morales nominated Porras as the new Attorney General and Chief of the Public Prosecutor's Office in May 2018, succeeding Thelma Aldana.

[6] Porras maintained a strained relationship with the Head of the Special Prosecutor's Office against Impunity, Juan Francisco Sandoval, finally dismissing him in July 2021.

[8] In December 2023, the Organization of American States called Porras' actions to annul the election of Bernardo Arévalo "an attempted coup d’état.

[11] On February 2, 2024, she was sanctioned by the European Union, making her subject to a travel ban and asset freeze in all 27 EU member states.

The decision was taken as a result of her persistent attempts to overturn the outcome of the 2023 Guatemalan elections and use of her office to initiate proceedings against journalists, activists and independent prosecutors and judges.