Watch: Will arrest of Gaza protester impact campus protests?
Hundreds have taken to the streets in New York City to call for the release of Mahmoud Khalil, a Columbia University graduate who was arrested for his role in last year's pro-Palestinian campus protests.
Mr Khalil was detained over the weekend, prompting criticism of the Trump administration and its efforts to deport him.
The Department of Homeland Security (DHS) has accused the former student of "leading activities aligned to Hamas", but provided no details.
The BBC's Nada Tawfik explains what this could mean for campus protests.
