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Oops! Scott Walker tweets he's 'in' ahead of launch

The tweet appears to have been a mistake. The Walker campaign is scheduled to launch on Monday.

This article has been updated.

"Scott is in. Are you?" Wisconsin Gov. Scott Walker tweeted Friday, three days ahead of his scheduled campaign launch in Waukesha. "Join our team today."

In what appears to have been a mistake, Walker announced his 2016 presidential bid from his verified account on the social network to his 148,000 followers, along with a black-and-white image of himself and the text, "Scott Walker is running for president. Join the team."

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As noted by Politico, "[t]he tweet was not available on his timeline later in the afternoon, but was still viewable under his account." The tweet was later deleted.

"Stay tuned for Governor Walker's announcement on Monday at 5pm CT," a spokesman for the Walker campaign said in a statement to NBC News' Kelly O'Donnell regarding Friday's tweet.

Late Friday, Twitter spokesman Nu Wexler issued the following statement: "We're looking into today's issue, and we've determined the Walker team was not at fault."

On Monday, Walker is slated to become the 15th GOP candidate to enter the race.