'He can't be trusted to keep this country safe,' Sunak sayspublished at 12:13 British Summer Time 15 May
Poking fun at Starmer for his earlier stutter, the PM says Starmer keeps showing that he's not fit to lead the country into the future.
Sunak says if Starmer was around during the Industrial Revolution he would have called James Watt the "steam bro".
The PM says Starmer voted against tougher sentences for criminals and voted against laws that have arrested criminal people smugglers.
"He can't be trusted to keep this country safe," he adds.