The Trump / Barr / Republican Enablers position is that:
A president cannot be indicted while he’s in office;
The attorney general’s decision to exonerate the president is not subject to question;
Congressional Committees have no right to examine critical potential evidence of presidential crimes;
When the founding fathers drafted the Constitution, they had no interest in protecting the United States from falling under autocratic rule even though gaining freedom from it was the purpose of the American Revolution.