As anticipated yesterday, all non-Ferrari-powered F1 teams issued a statement demanding clarity over the engine agreement between the FIA and the Maranello-based outfit.

Toto Wolff appears to be the promoter of such initiative, after the release came out at the end of last week. The statement implied the illegality of the 2019 Ferrari PU, although no further information was revealed as a result of a mutual deal between the two parties.
 
Furthermore, the FIA has been accused of an all-round lack of integrity and transparency. Hence came the necessity of pressuring the Federation to share the details of the agreement with full disclosure.

The chance of carrying out the issue to court also stands for an option.

Here is the full statement:

"We, the undersigned teams, were surprised and shocked by the FIA’s statement of Friday 28 February regarding the conclusion of its investigation into the Scuderia Ferrari Formula 1 Power Unit.
 
An international sporting regulator has the responsibility to act with the highest standards of governance, integrity and transparency.
 
After months of investigations that were undertaken by the FIA only following queries raised by other teams, we strongly object to the FIA reaching a confidential settlement agreement with Ferrari to conclude this matter.
 
Therefore, we hereby state publicly our shared commitment to pursue full and proper disclosure in this matter, to ensure that our sport treats all competitors fairly and equally. We do so on behalf of the fans, the participants and the stakeholders of Formula One.
 
In addition, we reserve our rights to seek legal redress, within the FIA’s due process and before the competent courts.
 
McLaren Racing Limited
Mercedes-Benz Grand Prix Limited
Racing Point UK Limited
Red Bull Racing Limited
Renault Sport Racing Limited
Scuderia Alpha Tauri S.p.A.
Williams Grand Prix Engineering Limited".

Backstory at: 

https://www.motorlat.com/notas/f1/14803/f1-teams-to-take-action-against-fia-ferrari-engine-agreement