The House of Commons was established in 1867, when the British North America Act 1867 created the Dominion of Canada, and was modelled on the British House of Commons. The House of Commons is sometimes called the "lower house", even though it has more power than the "upper house", the Senate. Both Houses is must agree to new laws but the Senate very rarely rejects bills passed by the Commons (though the Senate does occasionally amend bills). The Government of Canada is responsible only to the House of Commons. The Prime Minister stays in office only as long as he or she has the support of the Lower House. 