Reuters/Evelyn HocksteinDonald Trump publicly insisted on Monday that a key witness in Georgia’s grand jury probe shouldn’t testify this week as ordered—a brazen ask that one legal expert described as “witness tampering in real time.”Georgia’s former Lt. Gov. Geoff Duncan, a Republican, was the witness at the center of the early morning tirade from Trump, who has been raging for weeks as the Fulton County grand jury is seemingly inching closer to filing criminal charges against him over alleged