I like snopes. Their pretty good at using language that is non specific. They don’t disappoint in your link:
According to an 18 January 2018 McClatchy D.C. Bureau
report, the FBI is investigating allegations that Alexander Torshin, an official at the Central Bank of the Russia and life member of the NRA, funneled money through the gun lobby group to the Trump campaign.
The reporting was based on interviews with two unnamed sources familiar with the matter, but who requested their names be withheld because it involves classified and confidential information