Newt Gingrich expounded on his theory of Donald Trump’s bifurcated personality on Tuesday, explaining that the “very sensitive” Little Trump lashes out “almost uncontrollably” when criticized.

The former House speaker and top Trump surrogate told the Washington Examiner’s David Drucker that the Republican nominee loses his cool in response to “anything which attacks his own sense of integrity or his own sense of respectability, and he reacts very intensely, almost uncontrollably, to those kinds of situations.”

These rather harsh comments follow a Fox News interview last week in which Gingrich claimed that the Little Trump was “frankly pathetic” for attacking House Speaker Paul Ryan (R-WI) for neglecting to congratulate him on his performance in the second presidential debate.

While Gingrich noted that he admired Big Trump for disrupting the presidential campaign with his unorthodox behavior and far-reaching policy ideas, he said that the real estate mogul too often became embroiled in embarrassing public spats.

“There’s also a part of his personality that sometimes gets involved in petty things that make no sense, and I think that that’s what I was talking about when I talk about there’s a big Trump and a little Trump,” Gingrich said.

“The big Trump is a historic figure talking about historic ideas,” he went on. “The little Trump gets involved at a personality level.”

Gingrich claimed that his candidate remains a “remarkable and a very formidable player” despite his recent attacks on everyone from the Republican House speaker to a former Miss Universe.

Other Trump surrogates have also publicly criticized their candidate of late.

New Jersey Gov. Chris Christie (R) said he was “disappointed” by Trump’s defiant response to a leaked recording in which he can be heard boasting about groping women, while campaign manager Kellyanne Conway said she would not have taken Trump’s approach of mocking the looks of the women who have accused him of sexual harassment.

h/t Politico