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...