WASHINGTON — Representative Adam B. Schiff, the chairman of the House Intelligence Committee, said on Sunday that House Democrats were prepared to go to court to force the release of the final report from the special counsel, Robert S. Mueller III, and subpoena Mr. Mueller to testify if it was not made public.

Mr. Mueller, who has spent nearly two years investigating ties between the Trump campaign and Russia and whether President Trump tried to obstruct justice, is expected to submit his report to the Justice Department in the coming weeks, but the department is not required to release it.

“We will take it to court if necessary,” Mr. Schiff, Democrat of California, said on ABC’s “This Week.” “And in the end, I think the department understands they’re going to have to make this public.”

Justice Department regulations dictate that Mr. Mueller must submit a confidential report outlining his investigation and decisions to the attorney general, William P. Barr, who will then submit a summary to Congress.