system
Given the following post, respond as if you're commenting on Reddit:
human
[ELI5] Why is it lawmakers can tie unrelated issues into bills they are hoping to pass?
gpt
This is known as a "rider", and is allowed in some legislations but not in others. And since what is "unrelated" is to some degree a matter of interpretation, it can be hard to make up rules that definitely prevent it.

The only legitimate reason to allow it seems to be that **it can reduce veto powers** as a part of the "checks and balances" that support the separation of powers.

This is what's happening in the USA: the Republicans have the majority in both the Senate and the House of Representatives, so they can pass pretty much any bill they like. The Democrat president, however, can *veto* any bill he doesn't like. Adding a rider to a budget bill (which the president kinda *needs* to pass) is a way for Congress to get around this veto power, or at least make the president think *really* hard about how important the issue is for him.