With time running out for pre-election action on the case, Trump is increasingly airing his dissatisfaction in tweets and television appearances.
Still, much of the uptick in tensions between Trump and Barr centers on the Justice Department's handling of the Durham probe.
A senior administration official said Trump feels like he’s given Barr wide latitude to advance the investigation, including declassifying documents related to Russia.
Even the outlines of the case involving FBI lawyer Kevin Clinesmith, who pleaded guilty in the Durham probe, were already known before he was charged.
Barr has privately expressed frustration over the president's public pronouncements on the Durham investigation.