If a president is illegally mobilizing an army I'm not sure how this ruling would change anything? Do you think congress would be slower than courts to work thi

If a president is illegally mobilizing an army I'm not sure how this ruling would change anything? Do you think congress would be slower than courts to work this out? If a president was stopping congress from meeting then they could stop courts from meeting as well. Or he could just ignore the courts if it had really gotten that bad...