President Donald Trump has suspended the US green card lottery scheme in the wake of a mass shooting at Brown University last week in which two people were killed.

The suspect, a Portuguese man who was found dead on Thursday, entered the country through the diversity lottery immigrant visa programme (DV1) in 2017 and was granted a green card.

Homeland Security Secretary Kristi Noem stated she has paused the visa scheme under Trump's direction to ensure no more Americans are harmed by this disastrous programme.

US officials believe the suspect, 48-year-old Claudio Neves Valente, also killed Massachusetts Institute of Technology professor Nuno Loureiro earlier that week.

The program offers 50,000 visas annually through a random selection from entries submitted by countries with low rates of immigration to the US.

Noem highlighted that Trump had previously attempted to end the scheme in 2017, following a truck-ramming attack in New York City that killed eight people. The attacker had also entered through the DV1 scheme.

Neves Valente's connection to the shootings was confirmed when his vehicle was identified via CCTV footage, linking him to both the Brown University shooting and the murder of the MIT professor, both occurring within days of each other.

Two students, Ella Cook and Mukhammad Aziz Umurzokov, were killed in the attack at Brown University during final exams, marking yet another tragic chapter in the ongoing discussion surrounding gun violence and immigration policy in the United States.