Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: (CNN) South Carolina Gov. Nikki Haley on Tuesday brushed aside a series of attacks by Donald Trump and his top lieutenants with a quintessentially Southern response. "Bless your heart," the Palmetto State governor tweeted at Trump, brushing him back with some sharp-elbowed charm. Haley, who endorsed Florida Sen. Marco Rubio before South Carolina's February 20 primary -- which Trump won handily -- has ramped up her criticism of the billionaire front-runner ahead of the Super Tuesday contests. On Tuesday afternoon, Trump retweeted critical posts from two aides, both seeking to spread a video that first shows Haley in 2012 dismissing as a "distraction" calls for then-GOP hopeful Mitt Romney to release his tax returns, before cutting to a more recent rally when she demanded Trump do just that.Nikki Haley takes on Donald Trump with some Southern witThe Trump campaign is seeking to portray Haley as a hypocrite over tax return criticism 
 Question:_ tweeted to cap it off, though not before deleting a first attempt that misspelled her name.

Donald Trump