One key way the legislature can check the power of the chief executive is by overriding the executive’s vetoes. If the president vetoes a bill, both houses of the legislature can attempt to pass the same bill again with a two-thirds majority in each chamber. If achieved, the bill becomes law despite the president’s veto, curbing the executive’s ability to block legislative agenda. This mechanism ensures the legislature retains final influence over federal policy and lawmaking, even when the executive disagrees.
If you’d like, I can outline additional checks and how they interact in practice, such as confirmation of appointments, budget control, and impeachment, with brief examples from U.S. history.