Tom Brake, a Liberal Democrat MP, said that "I would suspect every single MP has received this abuse."
The mother of two was shot and stabbed one week before the EU referendum.
Israel’s intelligence agency is providing free lessons aimed at protecting politicians against stalkers and extremists.
Cox died on June 16 after being shot and stabbed outside a library in her constituency.
Two planes carrying a ‘Vote Leave’ banner were spotted over a memorial rally for deceased MP Jo Cox.
A moment of silence will take place at 4.25 p.m.
Combating domestic extremism in the U.K. is the responsibility of the police.
The fund's organizers will divide the money between three charities Cox supported.
She had also recorded a video about preventing Islamophobia.