Elinor Caplan, the MP for the Toronto-area riding of Thornhill, announced Monday she will not run in the next federal election.
Ms. Caplan, 59, "has decided to seek new challenges," said a news release from her office.
Ms. Caplan was elected in 1997 and again in 2000, serving for more than four years as a federal cabinet minister, first as minister of citizenship and immigration and then as minister of national revenue. She was dropped from cabinet when Prime Minister Paul Martin replaced Jean Chrétien.
"I've had the great honour and privilege of serving the people of Thornhill and the people of Canada, and after more than 25 years in public life, it's time to take on new challenges," Ms. Caplan said.
Before becoming a federal politician, Ms. Caplan represented the Toronto riding of Oriole in the Ontario legislature from 1985 to 1997. She served as a cabinet minister in the Liberal government of David Peterson, first as chairwoman of management board and later as minister of health.