BISMARCK, N.D. — North Dakota Congressman Kevin Cramer says his 35-year-old stepson is in critical condition at a Bismarck hospital.

Cramer told The Associated Press Saturday that Isaac Cramer is suffering from “failing liver and kidneys” and was taken to Sanford Medical Center Friday night.

Cramer says he and his wife, Kris, will disclose the cause of their son’s illness later but are asking for privacy and prayers at present.

Kevin and Kris Cramer have four other children.

The third-term Republican congressman officially launched his campaign last week for U.S. Senate, giving the GOP the candidate many consider the best hope of unseating Democratic Sen. Heidi Heitkamp.