Just before the start of her show on Tuesday, Van Susteren tweeted that she was "told this is certain" regarding Brown's status.
In a series of emails to Politico, Brown denied the report, saying that any such statement was "speculation." Brown recently renewed his contract with Fox News to serve as a contributor, amid reports that said the reverse.
“I am not sure who she talked to, but it was not me," Brown wrote. "I know what the timelines are and when I need to make a decision, one way or the other. I will make my decisions in due course."
Should Brown decide to run against incumbent Sen. Jeanne Shaheen (D-N.H.), HuffPost Pollster's latest chart shows he faces an uphill battle. According to a compilation of nine publicly available polls last updated on Feb. 20, Shaheen was holding just under a nine-point edge.