Courts have time and again backed up the right of Congress to show up unannounced to inspect a facility. The House is responsible for the power of the purse. Likewise they must be able to inspect places that receive taxpayer funds to see they are doing what they should to receive those funds. The only way to find out how those funds are being used is to show up unannounced to see just how a place is operated.

That the Turnip administration and ICE don't want to allow that tells you right off the bat, something shady is going on they don't want exposed to the public. This is not transparency, this is purposeful avoidance to prevent just such an unannounced visit that would catch them with their pants down. There have already been quite a few prisoners who have claimed that they are being treated with less than humane conditions. You might expect this of prisoners against their will to say so, but many claim this after being released and no longer in custody. Where there's smoke, there is usually fire or in this case where they don't want to allow access unannounced, there is something going on not kosher and they wish to keep it hidden.