US President Donald Trump announced on Monday the arrest of Mahmoud Khalil, a Palestinian student and "pro-Hamas" activist, on the campus of Columbia University in New York.

The arrest came under executive orders previously signed by Trump, with US authorities describing Khalil as a "pro-Hamas extremist."

Trump stressed that this arrest is the first of many to come, noting that there are other students at Columbia and other American universities involved in "pro-terrorist, anti-Semitic and anti-American" activities.

According to reports, Mahmoud Khalil was arrested at his Columbia University-owned apartment in Manhattan by U.S. Immigration and Customs Enforcement agents.

His green card, which allows him to live and work in the United States, was revoked. Khalil's lawyer, Amy Greer, said the arrest was made without warning and that he was immediately detained.

"The Trump administration will not tolerate this. Many are not students, but paid provocateurs," Trump said in a statement, adding that the administration would continue to pursue individuals who engage in activities that support terrorism or are hostile to the United States.

For his part, US Secretary of State Marco Rubio announced that the United States will cancel the visas and residencies of Hamas supporters in America, in preparation for their deportation.

"We will revoke the visas and/or green cards of Hamas supporters in America so we can deport them," Rubio said.

The move reflects growing tensions between the United States and Hamas, which Washington classifies as a terrorist organization.

This move also comes in the context of US efforts to monitor and hold accountable individuals suspected of participating in activities that support armed groups or are hostile to US policies.

The arrest has drawn mixed reactions, with some US officials supporting it as a necessary step to protect national security, while others have criticized it as a violation of civil rights and academic freedoms. The case is expected to spark a broader debate about the balance between national security and individual rights in the United States.