 Sewell supported a union of Upper and Lower Canada; however, in 1822, he opposed a legislative union because of the strong opposition to union in the province.In 1809, he published rules of practice for the Quebec Court of King's Bench and the Court of Appeals; James Monk published similar rules at Montreal, Lower Canada.In 1814, the legislative assembly voted to impeach Sewell and Monk on the grounds that some of their rules of practice were actually legislation, the responsibility of the legislature.