The Liberal Party of Canada is asking the federal ethics commissioner to look into a big mortgage given to embattled Tory cabinet minister Helena Guergis. They want to know if Guergis got preferential treatment to finance an expensive new home. Liberal member of parliament Marlene Jennings wrote to commissioner Mary Dawson on Tuesday, asking her to look into reports that Guergis was given a mortgage for the full CAN$880,000 (US$877,557) cost of the Ottawa home. Jennings says reports suggest a Bank of Nova Scotia branch in Edmonton granted the mortgage without requiring a down payment.