The FBI agent removed from the investigation being led by special counsel Robert Mueller into alleged Russian involvement in the 2016 election criticized Independent Sen. Bernie Sanders of Vermont in a text message.
Peter Strzok labeled Sanders an "idiot" and said Chelsea Clinton, the daughter of Democratic presidential candidate Hillary Clinton, was "self-entitled," The Daily Beast reported.
Strzok also sent a message to Justice Department attorney Lisa Page during a speech delivered by former Attorney General Eric Holder at the 2016 Democratic National Convention.
"Oh god, Holder! Turn it off turn if off!!!" he wrote, The Hill reported.
He described current President Donald Trump when he was still a presidential candidate as an "utter idiot" and a "loathsome human" in a text message sent to Page, The Hill reported.
When Trump nominated Sen. Jeff Sessions as attorney general, Strzok said, "Good god," according to The Daily Beast.
Republican Rep. Bob Goodlatte of Virginia indicated the report was troubling.
"These text messages prove what all suspected -- high-ranking FBI officials involved in the Clinton investigation were personally invested in the outcome of the election and clearly allowed their political opinions to cloud their judgment," stated Goodlatte.
Other Republicans have focused on defending Mueller, with concern growing that if he is weakened, Trump could move to fire him.
"There's all kinds of reasons to believe there's political interference, and we ought to get to the bottom of it," GOP Sen. Charles Grassley of Iowa, who chairs the Senate Judiciary Committee, told The Washington Post. "I've got confidence in Mueller, as far as what he's doing in the Trump-Russia investigation, and I don't have any reason to believe otherwise."
Republican Sen. Roy Blunt of Missouri struck a similar tone.
"Mueller's public service has been commendable up until now. ... He's a very capable guy, and I don't think you benefit by starting this process over again," he told The Post.
Blunt added that while he was concerned about the make-up of Mueller's team, he hoped that Mueller would learn a lesson from this experience.
Republican Sen. Lindsey Graham of South Carolina suggested that allegations of political bias at the FBI should be examined.
"This FBI agent doesn't taint Muller's investigation, because Mueller's going to be responsible for the final product," Graham said. "Mueller fired the guy, I liked that. But we need to have somebody looking at this other stuff, and it can't be Mueller."
In the House, voices have been raised in favor of Mueller recusing himself on the Russia issue, including GOP Rep. Matt Gaetz of Florida. He introduced a resolution in November calling for this and stated that he has received renewed support since the Strzok-Page texts were made public.