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The fact that someone had resorted to criminal activity such as defacing property was a "sad reflection of their values", she said.
"If this is the abuse they level at politicians, we can only imagine what the trans community has to endure at their hands."
The anonymous actions showed cowardice, she said.
Far from shaking her resolve, Ms Leary said that the graffiti attack had confirmed her commitment to advocating for the rights of all women, including trans women.
The vandalism was likely related to her open support of the Births, Deaths, Marriages and Relationships Registration Bill, which proposed changes to legislation which would make it easier for people to change their sex on birth certificates, she said.
Police would be investigating.