The North Dakota Republican also suggested COVID-19 death counts may be inflated.
The president said he will respect Cain's wishes and not nominate him for the role.
Three GOP senators — Utah’s Mitt Romney, Alaska’s Lisa Murkowski and North Dakota’s Kevin Cramer — told AP they’d likely vote against Cain.
Incumbent Heidi Heitkamp was viewed as one of the Senate’s most vulnerable Democrats this cycle.
Donors gave more than $12 million in 17 days -- although Heitkamp is still an underdog in next month's midterms.
Some women say they never authorized the North Dakota senator's re-election campaign to use their names in the ad.
From Wyndmere to Bismarck to Turtle Mountain, the Democratic senator sought to both defend and move past her vote.
Sen. Heidi Heitkamp, the North Dakota Democrat Cramer is challenging, responded by recalling her mom's sexual assault.
Rep. Kevin Cramer, who is challenging Sen. Heidi Heitkamp, had paid his wife more than $150,000.
It's going to be tough to find "good people" if they need to have a "perfect" high school record, says GOP Rep. Kevin Cramer, who's running for the Senate.