Mauricio Macri's candidate for Attorney General Inés Weinberg de Roca must wait another day for a decision about her appointment, after Peronists in the Senate announced they would not provide quorum for a confirmation vote.
The Accords Committee suspended a session into Weinberg de Roca's candidacy, which was scheduled for Wednesday.
The flat-lining of negotiations between the government's voting bloc and the opposition on this issue comes amid tension surrounding Senator Cristina Fernández de Kirchner's legal situation. The former president is facing fresh allegations of corruption, with the courts seeking a number of concessions from the Senate to strip CFK of immunity.
Weinberg de Roca has been spotted in the hallways of Congress since sessions began earlier in the year.
As a judge, Weinberg de Roca's rulings have tended to favour police empowerment in crime-fighting. She has also taken a firm stance against drug-trafficking.
The two also mix in similar social circles.
Born in Buenos Aires in 1948, Weinberg has an international reputation. She has been a judge in various courts since 1992, practising as a lawyer in the preceding two decades. She describes herself as the daughter of Holocaust survivors who escaped Nazi Germany.