Wrecking amendment
In legislative debate, a wrecking amendment (also called a poison pill amendment or killer amendment) is an amendment made by a legislator who disagrees with the principles of a bill and who seeks to make it useless (by moving amendments to either make the bill malformed and nonsensical, or to severely change its intent) rather than directly opposing the bill by simply voting against it. An important character of wrecking amendments is that they are not moved in good faith, that is, the proposer of the amendment would not see the amended legislation as good legislation and would still not vote in favour of the legislation when it came to the final vote if the amendment were accepted.