The latest congressional testimony about an infamous opposition-research dossier on Donald Trump is full of explosive allegations and suggestions about the real estate magnate-turned-president's potential dealings with organized crime figures, the sources of his often-bragged-about wealth and potential entanglement between Russia and the National Rifle Association.

, Glenn Simpson, a former Wall Street Journal reporter and a co-founder of Fusion GPS, talks at length about his firm's research into Trump's dealings and background.

Fusion GPS commissioned the dossier compiled by former British spy Christopher Steele,

The release of the testimony comes more than a week after . That move drew harsh condemnation from Trump, who referred to Feinstein as "Sneaky Dianne."