Checks on Presidential Power in Legislative Context

Consider the following scenario involving the legislative and executive branches of the United States government. After a heated election, the president is eager to implement a major piece of legislation that includes several contentious provisions. However, many members of Congress express strong opposition to certain aspects of this legislation. In response, the president threatens to veto the bill if it does not gain their support. This situation illustrates the dynamic interplay between branches that is a hallmark of the checks and balances system. Based on this context, which of the following best exemplifies a check on presidential power within this scenario?