Former Trump aide: President has 'thick skin’

A former campaign aide to President TrumpDonald John TrumpTrump mocks wind power: 'When the wind doesn't blow, just turn off the television' Pentagon investigator probing whether acting chief boosted former employer Boeing Trump blasts McCain, bemoans not getting 'thank you' for funeral MORE who's now a CNN contributor earned pushback during a panel discussion on Sunday when he said the president "has pretty thick skin."

CNN host Jake Tapper and other contributors on the panel interrupted when David Urban said, "I'm sure the president knows that people say bad things about him. He's got pretty thick skin."

"The thinnest skin I've ever seen," objected Symone Sanders, former press secretary for Sen. Bernie SandersBernard (Bernie) SandersWarren, Klobuchar call on FTC to curtail use of non-compete clauses RNC says it raised .6 million in February Pollster says 'it's certainly not looking good' for Trump ahead of 2020 MORE's (I-Vt.) 2016 presidential campaign.

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"He's a tough guy, he can take it," Urban maintained, despite the outburst during the panel discussion of Mick MulvaneyJohn (Mick) Michael MulvaneyMulvaney poised to become permanent White House chief of staff: report Pentagon sends Congress list of projects that could lose funds to Trump's emergency declaration Trump: Media 'working overtime to blame me' for New Zealand attack MORE, Trump's choice to be his acting White House chief of staff.

Comments Mulvaney made during the presidential campaign in 2016 have resurfaced since Trump's Friday announcement about Mulvaney, including one clip in which the former congressman said he supported Trump despite the fact that he's "a terrible human being."

Urban, who worked on Trump's 2016 campaign as an adviser, dismissed the idea that Trump hasn't seen the negative comments from Mulvaney.