This article, from a somewhat dubious news source (based on the other linked articles they were promoting), lost all credibility with the following statement. "There is a very tiny possibility of a white lion and white tiger meeting in the wild and producing an offspring."
Considering that white lions occur (extremely rarely) in the wild only in South Africa and white tigers occur (extremely rarely and not in the last half century) only in central India, I would say the possibility is more than very tiny. The article also states that ligers exist "mostly in captivity." Yes, especially if your definition of mostly means all or always.