Columbia University Saturday denied that the accused Uzbekistan man, who plotted to assassinate U.S. President Barack Obama, was admitted to their medical school.

Ulugbek Kodirov, 22, who pleaded guilty of plotting to kill the U.S. President in February, was sentenced to 15 years in prison Friday.

Kodirov's defense lawyer Lance Bell had claimed that Kodirov moved from Uzbekistan to New York in 2009 after he was admitted to the Columbia medical school but did not attend the school as he had poor English language knowledge, reported the Associated Press.

Kodirov later moved to Alabama and found a job where he accessed the internet services to connect with the members of an Uzbekistan Islamist group, who influenced him to turn against the United States. Kodirov plotted to kill the President but was arrested last year.

Just a day after he had been sentenced to prison, Columbia University rejected the defense claims stating that Kodirov was never given admission to the school. "From the immediately available records we have no knowledge of this individual and no record of him being an accepted student," the Associated Press quoted Columbia University spokesman Doug Levy as saying.

Levy said that it wouldn't have been possible for anyone with poor English knowledge to get admitted to the prestigious university as their interviews are conducted in English. "We certainly have students whose primary language is not English, but all of (the) application process and the interviews are conducted in English, as is our instruction," the Associated Press quoted him as saying.

"We seek a diverse population of students but they have to be able to effectively communicate with their peers and professors at the outset," he said.

Kodirov, who came to the United States on a student visa in 2009, was staying in the country illegally after his visa was canceled in 2010 as he did not join any institution. He may get deported to his country when his jail term gets over.