The committee consists of 11 Republicans and 9 Democrats.
The Chairman is Senator Chuck Grassley.
Here's what Grassley wrote about Fusion and the Magnitsky Act:
As you know, Fusion GPS is the company behind the creation of the unsubstantiated dossier alleging a conspiracy between President Trump and Russia. It is highly troubling that Fusion GPS appears to have been working with someone with ties to Russian intelligence –let alone someone alleged to have conducted political disinformation campaigns– as part of a pro-Russia lobbying effort while also simultaneously overseeing the creation of the Trump/Russia dossier. The relationship casts further doubt on an already highly dubious dossier.
The actions of Mr. Akhmetshin, Fusion GPS, and the others described in Mr. Browder’s complaint appear to show that they acted on behalf of a foreign principal. This is exactly the type of activity Congress intended to reach with FARA. When properly enforced, FARA provides important transparency. However, in this case, because none of the parties involved in the anti-Magnitsky lobbying had properly registered under FARA, these suspicious connections were not appropriately documented and brought to public light. In fact, it is unclear whether the FBI was or is aware of Fusion GPS’s pro Russia lobbying and connection to Mr. Akhmetshin, or that these efforts coincided with the creation of the dossier. Presumably, such awareness would have informed the FBI’s evaluation of the dossier’s credibility. This is why it is important for the Department of Justice to actually enforce FARA’s disclosure requirements.
[source : Letter to US Dept of Justice from Grassley]