HE'S IN: Marco Rubio will run for reelection

Marco Rubio is set to announce Wednesday that he will seek reelection to the US Senate.

A source familiar with the decision told Business Insider that the Florida senator had informed Republican officials about his plans.

The news was first reported by the National Review and The Washington Post.

The decision is a sharp reversal from what Rubio had repeatedly said on the campaign trail as a candidate for president. At the time, he insisted to reporters that he would not run for reelection to his Senate seat.

Rubio even went as far as to mock on Twitter reports that he would change his mind.

That tune slowly shifted in the weeks following his exit from the race. 

Rubio was lobbied by top Republicans, including Senate Majority Leader Mitch McConnell and presumptive Republican nominee Donald Trump, to run for another term. They viewed him as the best hope to retain the Senate seat.

A poll published Wednesday morning illustrated that point. It found that Rubio was the only Republican who led the Democratic challengers in the race. None of the other announced Republican candidates led either of the Democrats running. 

In the wake of the Orlando shooting, Rubio hinted he was reconsidering the decision. The Florida senator said the terror attack had prompted him to rethink about his "service to country." 

A spokesperson for Rubio did not immediately reply to a request for comment.