- Our Political Correspondent Phil Hornby explains what it all means:
Tensions are running high among Liberal Democrats after the decision of their candidate in Canterbury to step down.
Tim Walker announced that he was pulling out to boost the chances of Labour candidate Rosie Duffield, who narrowly won the seat from the Conservatives in 2017.
The national party is now reported to be considering imposing a fresh candidate, but Thursday is the deadline for nominations.
Lib Dem leader Jo Swinson, who visited a boxing gym on the campaign trail on Wednesday, says she's opposed to doing anything that helps Labour candidates.