02/02/2015 09:01 EST | Updated 04/04/2015 05:59 EDT

John Baird to resign as foreign affairs minister, sources say

Foreign Affairs Minister John Baird will resign from his position in the Harper cabinet as early as Tuesday, CBC News has learned.

Sources say that Baird, who has served in several of the highest portfolios in Prime Minister Stephen Harper's cabinet, has told members of his staff that he won't run again and will be resigning this week.

Baird's departure from cabinet, along with the resignation of Jim Flaherty a month before his death last year, means two of Harper's most powerful ministers will have left the prime minister's inner circle in less than a year.

A federal election is scheduled to be held in October of this year at the latest.

Baird, 45, has been in politics most of his adult life. He was first elected as an MP in 2006 after more than a decade in provincial politics in Ontario, where he served in former premier Mike Harris's cabinet.

Baird represents the riding of Ottawa West-Nepean, and has held senior cabinet roles ever since the Harper government was elected in 2006. These include:

- Minister of Foreign Affairs, May, 2011 to present.

- Government House Leader, August, 2010 to May, 2011.

- Minister of Transport, Infrastructure and Communities, October, 2008 to August, 2010.

- Minister of the Environment, January, 2007 to October, 2008 and again November, 2010 to January, 2011.

- President of the Treasury Board, February, 2006  to January 2007.

Baird was also a member of the House of Commons' Board of Internal Economy in 2010 and 2011.