Compare the vulnerability of the heads of executive departments versus those of regulatory agencies

Both types of heads can be fired at the president's will
Neither heads can be fired by anyone except a congressional committee
The heads of the former can be fired at the will of the president; while the heads of the latter can't be fired during their terms except for extreme misconduct.
In the former, heads cannot be fired during their terms of service, while in the latter, the president can fire the heads at will.

The vulnerability of the heads of executive departments and regulatory agencies differs in terms of their ability to be fired and the conditions under which they can be fired.

1. Firing Authority: In both cases, the president has the power to fire the heads of executive departments and regulatory agencies. This means that both types of heads are vulnerable to losing their positions at the will of the president.

2. Congressional Firing: While both types of heads can be fired by the president, only the heads of executive departments can be fired by a congressional committee. This adds an extra layer of vulnerability for executive department heads as their performance can be reviewed and questioned by the committee, potentially leading to termination.

3. Firing Restrictions: The heads of executive departments can be fired at the will of the president, meaning they can be removed from their positions at any time without requiring a specific cause or misconduct. On the other hand, the heads of regulatory agencies cannot be fired during their terms of service, except for extreme misconduct. This establishes a higher level of job security for heads of regulatory agencies compared to their counterparts in executive departments.

In summary, the heads of executive departments are generally more vulnerable to being fired than the heads of regulatory agencies. The heads of executive departments can be fired by both the president and a congressional committee, and they lack job security during their terms of service. Meanwhile, the heads of regulatory agencies are protected from dismissal during their terms, except for cases of extreme misconduct.