The Mail on Sunday, citing a source, reports that Walker denies the allegations and has more than 50 character witness statements.
It is understood that a previous internal investigation into claims against Walker was not upheld and no misconduct was found.
The trial will begin in London on 20 April and is listed for five weeks, according to Vanderpuije’s lawer Jonathan Coad.
Walker, who also previously appeared on Strictly Come Dancing, joined Vanderpuije as a co-host on Channel 5 News in 2022, external. Vanderpuije left Channel 5 News in 2024.
ITN CEO Rachel Corp is also listed as a respondent to the claim.
An ITN spokesperson said: “This claim, which is denied in full, will be addressed through the tribunal process.”
