Trump has been vocal in condemning the yesterday's attack carried out by the 29-year-old ISIS-inspired man who ploughed a pickup truck down a crowded bike path near the World Trade Centre, killing eight people and injuring nearly a dozen others.
"NYC terrorist was happy as he asked to hang ISIS flag in his hospital room. He killed 8 people, badly injured 12. SHOULD GET DEATH PENALTY! Trump tweeted, in reference to the FBI's statement that the attacker Sayfullo Habibullaevic Saipov was inspired by the ISIS and "requested to display ISIS's flag" in his hospital room.
Trump had yesterday supported the idea of sending the suspect to Guantanamo Bay terrorist detention centre in Cuba.
Presidents typically do not comment on pending criminal cases because of the potential impact their statements can have, the CNN commented.
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Trump said yesterday that it was "another attack by a very sick and deranged person" while extending his "thoughts, condolences and prayers" to the victims.
"The terrorist came into our country through what is called the 'Diversity Visa Lottery Programme'... I want merit based," he wrote on Twitter.
Saipov was today charged with terrorism offences by US prosecutors who said he decided to carry out the attack "to inflict maximum damage against civilians".
The FBI and New York Police Department are jointly investigating the terrorist attack, the deadliest in New York post 9/11.
Hours after the terrorist attack, Trump directed the Department of Homeland Security for "extreme vetting".