From the OP's citation:
“You have, both with Attorney General [Merrick] Garland and this select committee on 6 January, people who have run amok … they’re running over people’s civil liberties.
. . .
Gingrich also said the committee was “basically a lynch mob”.
Liz Cheney among those to condemn remarks by former House speaker as committee member Zoe Lofgren says: ‘I think Newt has really lost it’
www.theguardian.com
What civil liberties might Gingrich be talking about? Perhaps this?
One can imagine how easily these searches could become politicized: Personal details on Capitol Hill staff, state legislators, or donors are dispersed to partisans and suddenly leaked at an opportune political moment by some agency conveniently immune to the Freedom of Information Act and subject to limited oversight. After the aggressive leaking, spinning, and shaming that bureaucrats engaged in during the Donald Trump years, we’ve seen what’s possible.
Police surveillance is another way of keeping voters and the accountability they might bring at a healthy distance.
thefederalist.com
Politicized indeed. It doesn't take hardly any imagination who might have ordered the Capitol Police to conduct these "enhanced security measures", a shared responsibility of The Senate sergeant-at-arms which reports to the Senate majority leader and The House sergeant-at-arms reports which reports to the Speaker. Politicized indeed.
Capitol Police inspector general's office has heard about it, so some members of the Capitol Police view that direction they've been give with legitimate suspicion and concern, apparently.
Several Capitol Police intelligence analysts have already raised concerns about the practice to the department’s inspector general, according to one of the people who spoke for this story.
The little-known new practice by the department’s intelligence analysts, instituted since the Jan. 6 attack, is highly controversial given the civil liberties concerns it raises.
www.politico.com
Yet another federal agency politicized and wielded as a political weapon against political enemies? Spying on Congress? Isn't this one of a number of typical Democrat fingerprints?
White House declines to comment after Mark Udall says agency spied on staffers preparing scathing report into CIA torture after 9/11
www.theguardian.com