Caine’s nomination is likely to raise questions from some Democrats whether he will remain independent of Trump.

Retired Lt. Gen. John "Dan" Caine promised to stay out of politics and only provide President Donald Trump with honest assessments if confirmed as general and chairman of the Joint Chiefs of Staff.

Lt. Gen. Dan Caine says at his confirmation hearing that he is an “unconventional nominee” to be Joint Chiefs chairman, “but these are unconventional times.”