In an exclusive interview for CNN’s “In the Arena” with Eliot Spitzer to be broadcast at 8 p.m. ET Tuesday, the Texas congressman said the potential Republican presidential contenders are being “cautious.”

“They may believe that the president is stronger than most of the polls show,” Paul said. “The president is liked a lot and in politics, being liked is very important. So, maybe they don’t think he is as vulnerable as the polls indicate he might be.”

Paul is scheduled to formally announce his formation of a presidential exploratory committee, taking another step toward a bid for the GOP nomination.