The pair went head-to-head on another day of strikes across the UK.
As the government continues to resist the pressure from those demanding more pay and better working conditions, Mr Starmer is likely to focus his attacks once again on the issues at hand.
The prime minister, however, could push back by urging unions to negotiate moving forward.
“We know that there will be significant disruption given the scale of the strike action that is taking place and that will be very difficult for the public trying to go about their daily lives,” a spokesperson for Mr Sunak said of the strikes.
“We are upfront that this will disrupt people’s lives and that’s why we think negotiations rather than picket lines are the right approach.”