Trump said he would consider sending the suspect to the military prison at the USA naval base at Guantanamo Bay, Cuba, which his Democratic predecessor Barack Obama tried but failed to shut.
He repeated the call Thursday, saying he'd love to send the "NYC terrorist" to Guantanamo, but that process would take longer than going through the federal system.
Of course - as many pointed out Wednesday evening - Trump's public weighing in on the matter will likely make a compelling case for any defense lawyer looking to convince a judge to spare Saipov's life.
Trump took to Twitter to condemn the terrorist, and in doing so, suggested that he receive the death penalty.
Experts also said it would be highly improbable to send Saipov to Guantanamo because a federal judge would have to agree to turn him over to a military commission, and no person has ever been sent to Guantanamo straight from United States soil.
One of the two criminal counts Saipov faces, violence and destruction of motor vehicles causing the deaths of eight people, carries the death penalty if the government chooses to seek it, according to acting US Attorney Joon Kim. "Trump tweeted, adding: ".There is also something appropriate about keeping him in the home of the frightful crime he committed.
U.S. President Donald Trump on Thursday reiterated his call that the Uzbek immigrant accused of killing eight people by speeding a rental truck down a New York City bike path should get the death penalty.
"The New York terrorist was happy when he asked to hang the IS flag in his hospital room".
In the wake of a deadly terrorist attack in NY earlier this week, Trump on Wednesday suggested he'd be open to holding the suspect, a 29-year-old Uzbek national who has lived in the United States since 2010, as an enemy combatant at the Cuba facility nicknamed Gitmo. Authorities say the Uzbek immigrant said "he felt good about what he had done".More news: SA now the front-runner to host Rugby World Cup 2023
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On Wednesday, Trump said he felt the US criminal justice system was "a joke" because it took too long for accused terrorists - "these animals", he called them - to be prosecuted, convicted and sentenced. Prosecutors say he recruited and facilitated the travel of foreign fighters to join the Islamic State and extradited him from Bosnia.
Mary McCord, who oversaw the Justice Department's National Security Division before her departure in April, said she hoped Trump and Sessions were beginning to recognize the long and successful track record of federal terrorism prosecutors.
"We need to get rid of the lottery program as soon as possible", Mr Trump told reporters.
"Trump helped the terrorist with this tweet".
The US President's harsh public statements about alleged criminals, including the man charged in the NY truck rampage this week, could see them walk away with lighter sentences.
"If there was ever a candidate to be held as an enemy combatant for intelligence gathering purposes, it is Sayfullo Saipov - a self-declared 'Soldier of the Caliphate, '" Graham said in a statement.
Tuesday's assault was the deadliest in NY since the September 11, 2001, when more than 2600 people died in the World Trade Centre attack.
New York City police earlier in the day said that Saipov had carried out the attack according to instructions he found posted online by Daesh, on whose behalf he claimed to have acted.
No one arrested in the United States has ever been sent to Guantanamo Bay, and the last time a person arrested overseas was sent there was in 2008.