Congressional oversight of financial transactions ensures transparency and accountability in the government's financial operations. By monitoring financial activities, Congress can prevent misuse of funds and promote responsible spending. This oversight helps uncover possible corruption, fraud, or mismanagement of taxpayer dollars. It also enhances public trust in the government's financial decision-making processes. Through regular audits and investigations, Congress can identify areas for improvement and enact necessary reforms to safeguard the integrity of financial transactions. Overall, effective congressional oversight in financial matters plays a crucial role in upholding ethical standards and ensuring the financial well-being of the country.