White House counsel Pat Cipollone, calling on Nadler to "discontinue" his inquiry, argued in a letter that congressional investigations "are meant to obtain information to aid in evaluating potential legislation, not to harass political opponents or to pursue an unauthorized "do-over" of exhaustive law enforcement investigations conducted by the Department of Justice".
'Our investigation into this as well as other troubling conduct by this Administration will continue, ' vowed Nadler.
"Now it adds the extreme claim that Congress can not act either, because that would duplicate the special counsel's work", said Nadler.
Nadler said the White House's arguments were "ridiculous" and "un-American" and would hold the president above the law. "This is ridiculous. They would make the president above the law".
Judiciary panel voted to hold Barr in contempt of Congress after he defied the committee's subpoena for the unredacted report.
Nadler, in March, asked the White House for information from 81 individuals or entities connected to the president.
"Congressional investigations are meant to obtain information to aid in evaluating potential legislation, not to harass political opponents or to pursue an unauthorized "do-over" of exhaustive law enforcement investigations conducted by the Department of Justice", Cipollone said in his 12-page letter to Nadler. "Unfortunately, it appears that you have already chose to press ahead with a duplicative investigation, including by issuing subpoenas, to replow the same ground the Special Counsel has already covered".
The White House counsel urged Nadler to narrow his request.
"We will subpoena whoever we have to subpoena".
"The White House will not participate in the committee's "investigation" that brushes aside the conclusions of the Department of Justice after a two-year-long effort in favor of political theater pre-ordained to reach a preconceived and false result", Cipollone's 12-page letter said. "You'll hear from a lot of other witnesses".
But the White House is only directly responding to Nadler's letter to the White House. The Justice Department bars indictments of sitting presidents and Mueller's report made clear that the special counsel felt that the policy prevented him from saying definitively whether Trump's attacks on the investigation amounted to criminal obstruction. McGahn refused, according to the report.
Cipollone also said that, due to the apparent duplicative nature of the House investigation and the lack of an underlying legislative goal for them, "the requests raise serious concerns of violating the separation of powers enshrined in the Constitution".
He accused Nadler of trying to conduct a 'pseudo law enforcement investigation.' He claimed Nadler's inquiries 'bear no relation to any articulated goal of legitimate congressional oversight. It would need full House approval before the offender could be jailed or fined.
Nadler said they were seriously considering inherent contempt, which would be "in addition to" civil contempt proceedings through a lawsuit.