WASHINGTON — Rand Paul, the newly nominated Republican candidate for Senate from Kentucky, touched off more controversy on Friday by calling the Obama administration “un-American” for taking a tough stance with BP over the company’s handling of the oil spill in the Gulf of Mexico.

A day after he was forced to explain remarks he had made suggesting he was not fully supportive of the landmark Civil Rights Act of 1964, Mr. Paul set off yet another round of Twitter, cable television and e-mail chatter by lambasting President Obama and his aides for insisting that BP be held accountable — and pay — for the oil spill cleanup and damage.

“What I don’t like from the president’s administration is this sort of, ‘I’ll put my boot heel on the throat of BP,’ ” Mr. Paul said, referring to a remark by Interior Secretary Ken Salazar about the oil company. “I think that sounds really un-American in his criticism of business. I’ve heard nothing from BP about not paying for the spill. And I think it’s part of this sort of blame-game society in the sense that it’s always got to be someone’s fault instead of the fact that sometimes accidents happen.”

His Democratic opponent, Jack Conway, the state attorney general, has begun soliciting campaign donations by citing Mr. Paul’s recent statements. On the BP remarks, Mr. Conway said on Friday: “Rand Paul apparently has a deeply held conviction that corporations should be allowed to do what they see fit without oversight or accountability.”