He will fly to the US via Dubai, it is reported.
It is also said that he had left for the US due to the internal conflicts and disagreements within the Joint Opposition and he is expected to remain in the US for around three months.
However, he is said to have obtained court approval for his travel claiming to be undergoing treatment for his illness.
According to legal experts, he has the provisions to remain in the US for over three months for his medical treatment.
Meanwhile, former Defence Secretary Gotabhaya Rajapaksa is also currently in the US. Basil and Gotabhaya are both US citizens.