According to a report from ProPublica and the Texas Tribune, republished by Techdirt, the FBI's public corruption squad was circling Senator Susan Collins in the final weeks of 2019. The investigation was underway until, in the words of the article, Trump "got in the way."
The report describes a meeting between a top fundraiser for Collins and investigators at a Corner Bakery in Washington, D.C., calling it "perilous." The full details of the probe and the specific nature of Trump's interference are not included in the available excerpt, but the implication is that the investigation was disrupted or halted.
The episode raises questions about the independence of federal corruption investigations and the potential for political pressure to affect them. With only one source available, there is no conflicting account, but neither is there enough information to confirm the complete scope of the probe or the exact mechanism of interference.