"Helping GOP presidents act with impunity is William Barr’s stock-in-trade.Even before joining Trump, he wrote an unsolicited memo arguing outright that a president cannot be charged with obstruction of justice if the underlying actions fall under his lawful authority and the accusations are false.”For Barr, there are no apparent limits to presidential authority, at least as long as that president is a Republican. His theory of presidential immunity did not extend to Bill Clinton, for example, whose impeachment Barr defended.The memo even shows the same lack of interest in the facts of the investigation that Barr demonstrated during his exchange with Senator Kamala Harris of California, during which he admitted that neither he nor his office examined the evidence behind the Mueller report before determining the president could not be charged with obstruction of justice."