Rep. Adam Schiff (D-Calif.), the chairman of the House Intelligence Committee, told ABC's "This Week" that House Democrats will "obviously subpoena the [Mueller investigation's final] report" and work to have special counsel Robert Mueller testify before Congress if the Justice Department decides not make the report public.

The big picture: Schiff also said that he believes the Justice Department "understands" its role in making the report public, adding that there is "immense pressure" on Attorney General Bill Barr to ensure the report's release.

Go deeper: How the Mueller investigation could wrap up