Mary McCord, a former acting Assistant Attorney General for National Security, walked through the knock-on impact she says the recent U.S. Supreme Court presidential immunity decision will have on Congress. Writing for Just Security on Tuesday, McCord said that while attention has been paid to the power the ruling — which states presidents are immune from criminal prosecution for official actions carried out while in office — gives to Trump, it also has grave consequences for the other branches of the U.S. government. McCord pointed specifically to the “alarming abuses of official power that a…