It would be, but they are a rubber stamp for Trump now. Now only judges can stop the madness. Hopefully SCOTUS will actually do their job and make sure that Trump sticks to the law, which does not allow him to just defund programs set up by Congressional vote. Otherwise we wouldn't need a Congress. He's pushing at the walls to see how much he can tear down.
Anyone who's supposed to receive that money has standing and a federal judge can quickly rule that the status quo must remain while the case proceeds. The Trump administration can appeal that ruling but I think it would make it's way through the available steps relatively quickly.
The next steps are probably to cut funding anyway. I have a gut feeling that this is part of a larger power play that demonstrates that (this specific) President has no limitations on his power.