President Trump said the loss was an example of election fraud, but Mr. Pratt did not entertain that idea. Instead, he plans to wind down his campaign but keep attacking the two Democrats who advanced.
“I didn’t get in this for political power, I got in this to expose this corrupt machine, and nothing’s changed,” Mr. Pratt said. “ I don’t have a campaign laws hamstringing me now. It’s war.”
The lieutenant governor and the top elections official, both Republicans, are investigating whether the challenger coordinated with a Democrat to confuse voters.
Republicans argue that the Senate campaign by Dan J. Sullivan, right, was planned by Democrats to confuse voters and hurt Senator Dan S. Sullivan, left, a second-term lawmaker.