They swore an oath to support and defend the Constitution from enemies foreign and domestic, 5 USC 3331. The oath is not to a president. If staffers think the a

They swore an oath to support and defend the Constitution from enemies foreign and domestic, 5 USC 3331. The oath is not to a president. If staffers think the administration is ordering them to conduct in illegalities, they're obligated to resign. IANAL but that statute doesn't protect them from remaining in the job and actively thwarting the administration's policies even if they are illegal. There are whistleblower laws that might provide such protections. But as this regime has asserted the concept of the unitary executive, it's likely the case that whistleblower laws are in abeyance for the duration of the regime.