No doubt, DOJ lawyers already have prepared a motion for a temporary restraining order to prevent disclosure on the grounds that sources and methods will be revealed. If the motion is filed before the FBI/DOJ see the memo, then it will be clear those agencies know what the memo contains and want to suppress the content. Thus, the charade of demanding access and accusing the Committee of recklessness if the memo is disseminated to the public without prior disclosure to DOJ/FBI. Hopefully, the Committee will not be intimidated, and will vote to disclose the memo so the American people can get a true sense of the damage done to our country.
Congress doesn't answer to the DOJ. The DOJ would be laughed out of court.
If the President agrees with the release by the House, the DOJ has no standing.