Sen. Warren pledged to appoint officials who will reverse the DOJ policy that says a sitting president can't be indicted.
Annie Donaldson may be Congress' most important potential witness in the obstruction-of-justice investigation into Trump.
The president's former lawyer and fixer accused Jay Sekulow, Rudy Giuliani, Donald Trump Jr., and an unnamed intermediary of potential wrongdoing.
Initially, Trump was unequivocal in saying there was "no obstruction." On Thursday, Trump said there was "essentially" no obstruction.
