A similar amendment was passed in the House on August 2.
A similar amendment is awaiting action in the House.
The House rejected a similar amendment in 1999 by a 254-to-155 margin.
A similar amendment passed the House by voice vote last month.
A similar amendment in 1997 was opposed 114 to 57.
Senate aides say the House may consider a similar amendment covering gifts to its members.
Several similar amendments were also made to other Acts.
A similar amendment had been introduced in the Commons and quickly voted down by the government.
A similar amendment lost on a 210-to-210 tie vote last year.
The Commission has the same opinion of similar amendments to the second proposal.