It passed a committee vote on Monday.
The New York Civil Liberties Union has said if the county continues to push the legislation forward they will take legal action.
Blakeman first introduced the ban as an executive order before the Nassau County Supreme Court struck it down.
A statement released by Nassau County Minority Leader Delia DeRiggi-Whitton on Friday condemned bill.
"In light of the recent actions by Nassau County Executive Bruce Blakeman and the Nassau Republican Legislature regarding the transgender community, it is crucial to remind everyone that the New York State Attorney General has already deemed this proposal blatantly illegal," the statement read, in part.
The bill is slated to move to a vote before the full legislature, which gets underway on June 24th.
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