If I was to post anything as inciteful then I would expect to be arrested, and so should Polanski."
Farage has repeatedly highlighted concerns about his personal safety and that of his party members, especially following Widdecombe's murder, which is under counter-terrorism investigation.
A Green Party spokesperson explained that Polanski accepted the collaboration request to share images from a Green Party event in Bristol on July 26, but immediately removed the post once he realized it contained the controversial image.
They said, "Once this image was brought to his attention, he immediately unshared the post. He unequivocally does not support this type of dangerous message."
The phrase on the T-shirt references the 1979 song "Making Plans for Nigel" by English rock band XTC, as noted by some social media users.
The Metropolitan Police tweeted that they take reports of this nature very seriously and are actively investigating the matter.
Earlier in July, Farage met with the Home Office over his security arrangements.
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The government pledged to review security measures for MPs, especially in light of Widdecombe's murder, including those who are no longer serving but remain politically active.