A biased statement? I think Trump sucks is a biased statement. If a government employee utters that statement, it doesn't mean the government employee acted with bias in his role as a government employee. Most FBI agents have personal biases of some kind but as long as they don't act on these personal biases in their job, it is not a legal problem. Not acting on personal biases while on your job is what makes people in a variety positions professionals. The FBI Inspector General conducted an investigation at the conclusion of which he stated in a written report that Strzokdidn't didn't act on his personal bias against Trump. Do you get the distinction? I know Mr. Gowdy does, but that didn't keep him from trying to mislead the entire country.
If you want an example of government officials acting with improper bias, look at the arrest of Stormy Daniels in Columbus, Ohio. Police officers there acted on their personal bias and arrested Stormy for a crime she did not commit. Now they are on desk duty and will likely be fired at the conclusion of the investigation into their actions. In addition, the taxpayers of Columbus, Ohio will be footing the bill for millions of dollars in legal fees and settlement costs/judgment costs when Ms. Daniels sues them. If the police officers had merely texted each other and said we have to stop Stormy but never acted upon it, they wouldn't be in trouble now, nor would the taxpayers of Columbus, Ohio be on the hook right now. Do you see the distinction between having a bias and acting on one?