The prime minister will appear before the Commons Liaison Committee for 90 minutes, during which he will be asked about Dominic Cummings's controversial lockdown trip to County Durham.
More than 35 Tory MPs have called for Mr Cummings to resign or be fired after his 260-mile journey came to light
The Conservative MP for Congleton Fiona Bruce released a statement last night saying her constituents are "entitled to feel badly let down" by the actions of Mr Cummings but didn't say he should go.
But Birmingham Northfield Conservative MP Gary Sambrook questioned whether the public care about the issue as much as the media.
"I've had emails which constitute less than half a percent of my total constituents. Yes the vast majority of those emails are against what Mr Cummings did but there's no way of really assessing public mood," he said.