Why does the US want to deport Salah Sarsour?

A US judge has ruled that prominent Palestinian rights advocate Salah Sarsour can be deported. This decision was made under a controversial law originating from the cold-war era. The article does not provide further details on the specific reasons for the deportation order or the exact timing of the ruling. The core of the news is the judge's decision to allow Sarsour's deportation based on this particular legislation.