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The Donald Trump campaign's national spokeswoman responded this morning to Sen. Lindsey Graham's (R-SC) endorsement of Jeb Bush in the 2016 presidential race. 

Graham, who ended his bid for the nomination last month, made the announcement alongside Bush in South Carolina this morning. 

Graham touted Bush as the candidate who is most ready to lead on "day one" of his presidency. 

Martha MacCallum discussed the news with Katrina Pierson, shortly after Trump tweeted his thoughts...

Pierson said the Republican establishment is "circling the wagons" right now, recalling that in 2012 Newt Gingrich won the South Carolina primary "handily" despite Mitt Romney getting endorsements from Graham and Gov. Nikki Haley. 

She emphasized that Trump will not be going back on his proposal to halt immigration into the U.S. by Muslims, as Bush called on him to do last night. 

Pierson said that Trump's support has remained at 40 percent in South Carolina since the Muslim remarks and that the United States' visa system has been exploited in the past. 

"We have to remind people that the 9/11 hijackers trained in Florida under Jeb Bush's watch [and] came here on tourist visas. We have no idea who's in our country today. We have to halt this process of immigration from Muslim nations until we can get processes and procedures in place to vet them accordingly," she said.

Watch Pierson's response above, and Graham and Bush's remarks below.

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