(CNN) Abdullah Hassan, who was on life support by the time his Yemeni mother was granted a visa to see him one last time, has died.

The 2-year-old passed away Friday at the UCSF Benioff Children's Hospital in Oakland, California, according to the Council on American Islamic Relations.

His mother, Shaima Swileh, was barred from traveling to the US under the White House travel ban that restricts Yemeni nationals from entering the country. She was granted a visa by the US State Department last week and shortly after arrived in California.

Her husband, Ali Hassan, flew with their son to the US on October 1 seeking treatment for the boy's genetic brain condition. Abdullah was the couple's only child.

Both Abdullah and his father were US citizens.

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