Joe Raedle/Getty ImagesDonald Trump wants Florida Sen. Marco Rubio to run for re-election for the sake of keeping a Republican majority, he suggested in a tweet Thursday evening. Rubio has been firm that he will not run again, and has also made clear that he would not accept any offer from Trump to run as his vice-presidential nominee. Trump’s tweet is the latest indicator that the frosty relationship between the two men appears to be warming. The candidates had aggressively attacked one another in the weeks preceding the Florida primary. Trump had dubbed Rubio “Little Marco,” and Rubio had called Trump a fraud and a “con artist." On Thursday, Rubio said in a CNN interview with Jake Tapper that, if asked, he would speak on Trump’s behalf at the Republican National Convention in July. “Certainly, yeah.