TORONTO - A 2013 note in which then-Liberal leadership contender Justin Trudeau predicted he would beat Prime Minister Stephen Harper is up for sale on eBay.

Michael Kydd was on Porter Airlines flight on March 20, 2013, and passed a note to Trudeau asking "Can you really beat Harper?"

Trudeau responded with a quote from his late father -- former prime minister Pierre Elliott Trudeau -- "Just watch me."

Trudeau, who was running for the Liberal leadership at the time, confirmed he wrote the note in a tweet on the same day saying, "Yup, it was me."

Bidding on the note -- which had attracted a top bid of $3,950 by Thursday morning -- ends Thursday afternoon.

Trudeau's father replied "Well, just watch me!" on Oct. 13, 1970, when asked by a reporter how far he would go in limiting civil liberties to combat separatist terrorists during the October Crisis.

Three days later, Pierre Elliott Trudeau invoked the War Measures Act, giving police more power in response to the kidnapping of British diplomat James Cross and Quebec provincial cabinet minister Pierre Laporte by the FLQ.