By Joseph Ax (Reuters) – Mark Meadows, Donald Trump’s former White House chief of staff, was ordered by a South Carolina judge on Wednesday to testify in a Georgia criminal probe investigating whether the former president and his allies broke the law by trying to overturn the 2020 election, according to media reports. Meadows had asked a judge in South Carolina, where he resides, to quash a petition seeking his testimony issued by a grand jury in Fulton County, Georgia, where the district attorney’s office is overseeing the investigation. The court hearing took place in Pickens County, South C…