general election
"I share the anger, I share the frustration," Michael Tomlinson said.
Rishi Sunak had faced calls to withdraw support for those involved in the alleged scandal.
But former Olympian James Cracknell said voters should still back the Tories on July 4.
The party said the current law was "intrusive and outdated".
The Conservatives have fallen even further behind Labour with less than two weeks until polling day.
Fears politics is failing to engage those aged under 35.
Labour, the Lib Dems and Reform UK all raised more cash in the second week of the campaign.
HuffPost UK joined the prime minister for a few hours as he tries to grab any Conservative votes he can.
Chris Skidmore accused Rishi Sunak of "siding with climate deniers".
"Didn't he used to have a face?"