They are public servants who, the leadership (1 or 2) aside, stay the same irrespective of changes in government. I know some FBI agents and they are all 100% Rs, but more so 100% law enforcement. They take their jobs seriously and would not be manipulated by some random pol. The article was about criticizing agents doing their job. It didn't even mention that the judge who issued the warrant has received death threats.
TBH, the warrant is red meat to the Rs and they are all over it for political capital. It was lawfully issued and lawfully executed. If Trump still had documents that he wasn't supposed to have, as is alleged then he's an idiot. That's a felony, because Trump made it a felony while he was the President. If they contain classified docs including nuclear secrets as is now being alleged, then that's beyond idiotic. Hopefully the warrant will be unsealed and the details will come out.