(POLITICO) — Leave it to Robert F. Kennedy Jr. to one-up Rush Limbaugh in the name-calling department.

“Speaking of prostitutes, big oil’s top call girl Sen. Inhofe wants to kill fuel economy backed by automakers, small biz, enviros, & consumers,” the New York-based environmentalist wrote Tuesday on Twitter.

Kennedy was targeting Inhofe for a letter the Oklahoma Republican sent last week to EPA Administrator Lisa Jackson that questions the Obama administration’s fuel economy and air pollution policies.

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Inhofe spokesman Matt Dempsey said Kennedy’s tweet crosses the line, especially in the wake of Limbaugh’s apology to a Georgetown University student after calling her a ‘prostitute’ during an on-air broadcast.

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