Glenn Simpson, founder of the research firm Democrats hired to dig into President Trump during the 2016 race, told congressional investigators that the author of a controversial Trump dossier believed the candidate “was being blackmailed” and urged the firm to contact the FBI, according to a transcript released on Tuesday.

Hillary Clinton and the Democratic National Committee hired Fusion GPS, Simpson’s firm, to research Trump in 2016. Fusion GPS in turn hired Christopher Steele, a former top British intelligence officer, to dig into Trump’s business dealings in Russia.