 Thompson would go on to sit three times in the House of Commons of Canada, always representing the federal constituency of the Yukon.A Conservative, he first sat in the House between 1904 and 1908, taking the seat away from his main rival, former Yukon Commissioner Frederick Tennyson Congdon.The seat had recently been vacated by another former Yukon Commissioner, James Hamilton Ross, because of his appointment to the Senate of Canada.