The two Senate leaders must be in agreement in order to issue an order.

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The committee recently issued its second round of subpoenas in the investigation to businesses associated with former national security adviser Michael Flynn, whom Trump forced to resign in February.

The panel has also requested information from other former Trump associates — Carter Page, Paul Manafort and Roger — but has not issued subpoenas.

Manafort recently turned over hundreds of pages of documents to the committee voluntarily.