It's not really a very strong bargaining chip for the EU commission, because ECJ and ECHR can independently rule certain decisions to share data as unconstituti

It's not really a very strong bargaining chip for the EU commission, because ECJ and ECHR can independently rule certain decisions to share data as unconstitutional or as violations of the human rights of European citizens. So the commission cannot simply agree to set up particularly lax data sharing standards that the US would like to have, for instance. It's already dubious enough whether the Privacy Shield would withstand additional legal scrutiny by ECJ, and this also depends on actions of the current US government to conform with it.