Former 2012 Republican presidential nominee Mitt Romney on Thursday ripped Harvard's decision to hire Chelsea Manning as a visiting fellow.

Romney made the comment in a tweet Thursday evening, in which he also praised former Deputy CIA Director Michael Morell's decision to resign from his position as a senior fellow at the university.

"Well done, Mike. And abject shame on Harvard," Romney tweeted, along with a copy of Morell's resignation letter.

Well done, Mike. And abject shame on Harvard. https://t.co/SfI1HxDpdD — Mitt Romney (@MittRomney) September 14, 2017

Manning was convicted in 2013 for releasing confidential military and State Department documents. Former President Obama commuted her sentence last year.

Manning will join former White House press secretary Sean Spicer and Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE's campaign manager Robby Mook at the Ivy League school.

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Morell said the decision to hire Manning legitimized her as a "criminal leaker."

"Unfortunately, I cannot be part of an organization — The Kennedy School — that honors a convicted felon and leaker of classified information, Ms. Chelsea Manning, by inviting her to be a Visiting Fellow at the Kennedy School’s Institute of Politics," Morell said in his resignation letter.

The former CIA official said he had an obligation to his conscience and country to "make the fundamental point that leaking classified information is disgraceful and damaging to our nation."