(CNN) — The two co-founders of the firm behind the infamous Steele dossier are publicly pushing back against the Republican Party’s handling of the investigation into the Trump campaign’s potential ties to Russia.

The dossier, which began as an opposition research effort and became publicly known in early 2017, details Russian interference in the 2016 election and includes allegations that Russian operatives claim to have compromising personal and financial information about President Donald Trump. Some of the dossier’s most salacious allegations have not been corroborated by the intelligence community or CNN.

Trump and his Republican allies have seized upon the disclosure late last year that law firm Perkins Coie paid Fusion GPS — which in turn hired former British intelligence officer Christopher Steele — for the dossier on behalf of its clients, the Hillary Clinton campaign and the Democratic National Committee, arguing it shows the dossier is a Democratic effort to undermine Trump.

Click to continue reading. Updated Wed January 3, 2018.