The co-founder of Fusion GPS, the firm behind the unverified Trump dossier, met with a Russian lawyer before and after a key meeting she had last year with Trump’s son, Fox News has learned. The contacts shed new light on how closely tied the firm was to Russian interests, at a time when it was financing research to discredit then-candidate Donald Trump.

The opposition research firm has faced renewed scrutiny after litigation revealed that the DNC and Hillary Clinton’s campaign paid for that research. Congressional Republicans have since questioned whether that politically financed research contributed to the FBI’s investigation of Russian collusion with the Trump campaign – making Fusion’s 2016 contacts with Russian interests all the more relevant.

The June 2016 Trump Tower meeting involving Donald Trump Jr. and Russian lawyer Natalia Veselnitskaya occurred during a critical period. At that time, Fox News has learned that bank records show Fusion GPS was paid by a law firm for work on behalf of a Kremlin-linked oligarch while paying a former British spy Christopher Steele to dig up dirt on Trump through his Russian contacts.