House panel gathers mountain of evidence in Capitol attack investigation

But those communications and other documents that Meadows turned over represent just a small sample of evidence potentially incriminating the Trump White House collected since September.

Bennie Thompson, the panel chair, said on Monday that after depositions this week, the panel was on track to interview more than 300 witnesses and add to the more than 30,000 documents already turned over.

The select committee also obtained about 6,000 documents from Meadows as part of a delicate cooperation agreement requiring the production of non-privileged material, before Meadows abruptly broke off the deal last week.

The select committee has in recent weeks issued subpoenas for the call detail records of several hundred phone numbers, which typically reveal the date, time, duration and target numbers of calls, according to a source close to the investigation.

Such records are expected to prove a boon for the inquiry, the source said, since it enables House investigators to map a pattern of which phone numbers were being dialed, and to connect key phone numbers to others on 6 January and the days and weeks before.

The select committee is on track to obtain those records, which Trump has claimed are subject to executive privilege and cannot be given to Congress, after the US court of appeals for the District of Columbia last week upheld a lower court ruling approving their release.

Among the messages to Meadows that the committee disclosed was one from an unidentified Republican lawmaker, who apologized to Meadows after the Capitol attack for not succeeding in stopping Joe Biden from being pronounced president.