Bashir Khan says Canada risks breaking international law if Bibi, 65, is deported to her native Pakistan on Tuesday.
"She has outstanding criminal charges [in Pakistan] that have been filed against her for the crime of adultery," Khan said in an interview with CBC News.
"She is a target for honour killing by her ex-husband's family. The Islamic way of doing that is stoning to death."
Lawyer scrambles to file federal case
Khan said he filed a case —a motion for a stay of removal— with the Federal Court this morning. Today at 3 p.m. CDT, the court of Canada will hear Khan's plea to keep Bibi in Canada
Khan noted that typically a person is given eight to 10 days notice by the Canada Border Services Agency before being deported. In this case, Bibi was given five.
The United Nations' Office of Human Rights began looking at Bibi's case in November, but has yet to recommend whether she should remain in Canada because she's at risk.
Khan said it's wrong for Canada to deport her before the UN office issues its report.
Bibi arrived in Canada in 2007, claiming refugee status.
Canada rejected that claim and, in 2011, the government deemed her "deportation ready." But in 2012, Khan successfully got the UN involved.
It started investigating, but last week Canada gave word that Bibi had to go.
"They are no longer going to wait for the United Nations decision, and they're going to unilaterally, in violation of international law, deport this poor lady," Khan said.
"Somebody should not be deported because there's an imminent risk of irreparable harm to them."
Supporters of Bibi rallied this weekend in Saskatoon.