Maine's independent senator joins Democrats in voting against the Trump nominee over concerns about his answers regarding the rules of international warfare.

Pete Hegseth's former sister-in-law said in an affidavit to senators on Tuesday that President Donald Trump's pick to lead the Pentagon abused his second ex-wife to the point where she once hid in a closet and gave friends a code word to use in a crisis.

The nominee can only afford to lose three GOP senators if Democrats unite against him so attention could now shift to Maine Republican Sen. Susan Collins and other potential swing votes.