Sen. Claire McCaskill pushed back Thursday against personal criticisms regarding her military sexual assault proposal, amid a growing wave of support for an alternative proposal offered by Sen. Kirsten Gillibrand.

Momentum appears to be behind Gillibrand’s proposal, which would move the decision over whether to prosecute a sexual assault case outside of the chain of command. McCaskill’s proposal would keep the decision within the chain of command, and force higher ranking officials to review a case if the decision is made not to prosecute.