Former attorneys general William Barr and Jeff Sessions have both said they were unaware of the subpoenas.
An official within the Justice Department insists John Demers’s resignation is not related to the controversy.
“To say that they didn’t know anything about it is beyond belief,” the Speaker of the House said on Sunday.
The “politicization” of Trump’s Department of Justice “is harrowing,” Speaker of the House Nancy Pelosi said.
Roberts, who cast conflicting votes in two recent immigration cases, is the wild card here.
Sessions tries to reconcile with his former boss in his first campaign ad, saying: “He has my strong support.”
Trump’s administration separated thousands more children from their parents than was previously known.
Families and supporters of Alabama’s incarcerated have organized a protest at the State Capitol on May 13.
Newly confirmed Attorney General William Barr has promoted anti-immigrant and racist policies throughout his career.