Informal Power of Veto
The President has the informal power to use the veto in a very effective manner. This power comes from the ability of the President to influence the legislative process and the behavior of Congress through various means.

Relationship Building
One way the President can effectively use the veto is by building relationships with members of Congress. By forming alliances and working closely with key legislators, the President can better communicate their priorities and influence the decision-making process.

Threat of Veto
The President can also use the threat of veto as a bargaining tool. By making it clear that they will veto a particular piece of legislation, the President can compel Congress to make changes or concessions in order to avoid a veto.

Public Opinion
Public opinion can also play a significant role in the President's ability to use the veto effectively. By mobilizing public support for or against a particular bill, the President can put pressure on Congress to act in a certain way or risk facing backlash from their constituents.

Dealmaking
Finally, the President can engage in dealmaking with Congress to ensure that their priorities are reflected in legislation. By negotiating with lawmakers and offering incentives or concessions, the President can secure the passage of bills that align with their agenda.
In conclusion, the informal power of the President to use the veto in an effective manner lies in their ability to build relationships, leverage the threat of veto, mobilize public opinion, and engage in dealmaking with Congress. By strategically employing these tactics, the President can effectively shape the legislative process and advance their policy goals.