Critics warn that the present partisan rhetoric could shake public trust in courts by undermining the institutional legitimacy of the criminal justice system.
"Undercutting the system of government is a serious matter and a threat to our future," she said in an interview.
Bragg, a Democrat, on Friday warned Republican Representatives Jim Jordan, James Comer and Bryan Steil, who are leading the probe, against attacking the criminal justice system.
Historians including Princeton University professor Julian Zelizer said Republican statements about Bragg and the criminal justice system follow a long-established partisan line.
Nicole Hemmer, director of the Rogers Center for the American Presidency at Vanderbilt University, warned that Republican attacks on the U.S. criminal justice system could ultimately have dire consequences for courts and juries.