Former Attorney General Bill Barr called the newest federal grand jury subpoenas probing the Jan. 6, 202, Capitol riot "a significant event," one that suggests that government prosecutors are probing high-ranking Trump administration officials and allies, and even former President Donald Trump. "This suggests to me that they're taking a hard look at the group at the top, including the president and the people immediately around him who were involved in this," Barr told CBS News' Catherine Herridge in an interview Friday.