The main purpose of this legislation, known as the "Closing Bribery Loopholes Act," is to strengthen the laws against bribery of public officials and witnesses. It aims to clarify what constitutes an "official act" in the context of bribery, ensuring that the law is more effective in preventing corrupt practices. The key provision of this legislation is the revised definition of "official act." The new definition expands the understanding of what actions can be considered as official duties.