This thread started when you said that congress could end the DOJ and the FBI. Congress doesn’t have the power to do this without either the president’s support, or a 2/3 majority in both houses. Congress has neither, so your statement was incorrect. It’s important to stick with realistic expectations.
Congress most certain does have the power.
You’re thinking about politics, not legality - which is what my comment was directed at, hence the link to the DOJ page listing the statutes by which is was created.
A divided Congress Could easily END the FBI and the DOJ by REFUSING to Fund it in the House, REGARDLESS of what the President or Senate Wants.