New revelations about one of the FBI’s top investigative agents have cast a “cloud” over the agency’s handling of the investigation into former Secretary of State Hillary Clinton’s email server, former FBI Assistant Director Chris Swecker said Monday night.

FBI agent Peter Strzok, a key figure in both the FBI’s Clinton investigation as well as the ongoing Russia probe, exchanged anti-Trump, pro-Clinton texts last year with an FBI lawyer who was also his mistress.

Strzok, it was revealed on Monday, softened then-FBI Director James Comey’s draft description of Clinton’s email conduct from “grossly negligent” — a legal term that correlates with criminal penalties — to “extremely careless.” Additionally, Strzok conducted the interviews with two of Clinton’s aides when they gave false statements to the FBI. (RELATED: Anti-Trump Text Messages Show Pattern Of Bias On Mueller’s Team)

The scandal around Strzok has damaged the FBI, which still has “some disarray that is left over from the Comey era,” Swecker said in a “CNN Tonight” appearance on Monday night.

WATCH:

“How damaging is this news to the FBI, if at all? Is it damaging?” host Don Lemon asked.

“I think it is damaging because [Strzok is] now firmly a defense witness, for anyone that’s charged relating to the Russia investigation,” Swecker said.

“And it just casts a cloud over much of the Clinton investigation, in my opinion, the e-mail investigation,” Swecker said, noting that Strzok “was a very key agent in so many different things.”