Answer:
Department of Justice
Step-by-step explanation:
When the President's actions are in question the executive department that is charged with the responsibility of calling the President to order is the Department of Justice.
The Department of Defense is charged with Military actions overseas and even domestic military actions protecting the United states against Military attacks from foreign nations and also protecting the country against enemies within as well. while the department of homeland security is charged with protecting the citizens against internal crisis especially against terrorism activities.