The U.S. Navy SEAL who killed Usama bin Laden is not a fan of President Trump's call for a military parade in Washington, and he made his opinion clear on the commander-in-chief's favorite social media forum.

Robert O'Neill, who is also a Fox News contibutor, tweeted Thursday that the idea floated by Trump, whose campaign he supported, is not something the world's lone superpower should consider.

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"A military parade is third world bulls---," O'Neill tweeted. "We prepare. We deter. We fight. Stop this conversation."

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When a user pointed out that France and Russia conduct military parades, O’Neill replied: "Yes. Third World. If Russia or France were powerful enough to take over the world, they would. We are yet we don’t. That’s called First World."

O’Neill has been a Trump supporter since the 2016 campaign. The two dined at the White House last fall and did a photo-op.

Trump reportedly said he was inspired to stage a military parade in Washington on July 4, after watching France’s Bastille Day military parade last July.

Rep. Jackie Speier, D-Calif., told CNN Tuesday that she was "stunned by it," and that "we have a Napolean in the making here."

Rep. Ted Lieu, D-Calif., said, "Basically anything," would be more useful than asking the Pentagon to waste money on a big military parade.

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White House Press Secretary Sarah Huckabee Sanders told reporters on Wednesday that "nothing has been decided," and that the White House hasn’t made a final decision.