He also called for an inquiry into what he said amounted to a "terrible abuse of power".
Schiff said, "I think there needs to be an internal investigation within the Department of Justice".
One of the Democrats was Adam Schiff, who now serves as the chairman of the House Intelligence Committee.
The committee has continued to seek additional information, but the Justice Department has not been forthcoming in a timely manner, including on questions such as whether the investigation was properly predicated and whether it targeted only Democrats. "It is increasingly apparent that those demands did not fall on deaf ears", Schiff said in a statement.
Schiff, now the panel's chair, confirmed in a statement Thursday evening (local time) that the Justice Department had informed the committee in May that the investigation was closed.
While searching for the source of leaked intelligence regarding the Russian Federation investigation, Trump's Justice Department seized records from Apple belonging to Democrats in Congress, The New York Times reported Thursday.
Rep. Eric Swalwell, D-Calif., another member of the House Intelligence Committee, told CNN host Don Lemon that he was the second Democratic lawmaker targeted by the Trump Justice Department via Apple.
The gag order was renewed three times before it expired this year and Apple notified the customers. The committee is aware, though, that metadata from the accounts was turned over, the official said.
The Justice Department was also said to have obtained a gag order preventing Apple from alerting lawmakers. "But William P. Barr revived languishing leak investigations after he became attorney general a year later. These actions appear to be yet another egregious assault on our democracy waged by the former president", she said.
The seizure of such records has rarely been seen outside of corruption investigations.
"There must be a full investigation of abuses under former Attorneys General Sessions and Barr, and anyone at DOJ who was complicit in these abuses of power can not be trusted to continue serving in government", the statement said.
An Apple spokesperson did not return Fox News' request for comment.
It was also recently revealed that the records of several journalists were secretly obtained in an effort to reveal their confidential sources. Why is it such a big deal?
SCHIFF: Well, it's, you know, really norm within norm within norm being broken here. The judge, in that case, appointed someone to advocate someone against the Justice Department. That is even a more important norm.
One of the family members targeted was a minor, the paper reported.
And that - that is, I think, a bad abuse of power. Biden's Justice Department has vowed to end the practice. And that does such damage to the department.
While the Justice Department routinely conducts investigations of leaked information, including classified intelligence, opening such an investigation into members of Congress is extraordinarily rare.