Trump adviser: 'He should stop saying things that are untrue'

Stephen MooreStephen MooreTrump formally announces intent to nominate Waller, Shelton to Fed Contrary to what the media reports, middle class Americans are surging Juan Williams: Trump is all bluster on trade MORE, an economic adviser to President TrumpDonald John TrumpTrump denies telling Bolton Ukraine aid was tied to investigations Former senior Senate GOP aide says Republicans should call witnesses Title, release date revealed for Bolton memoir MORE, said that he thinks that the president "should stop saying things that are untrue."

"I think when Trump says things that are false, that does undermine his presidential authority and I wish he wouldn't do it," Moore told host Mehdi Hasan on Al Jazeera's "Head to Head." "He should stop saying things that are untrue."

Hasan then pressed Moore, asking him "So he's a liar?"

Moore seemed to balk, admitting that Trump is "an exaggerator" and that he believes "it gets him in trouble," but saying he wouldn't call him a liar.

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"I'm not here to defend everything that Donald Trumps says," Moore noted later in the interview.

Hasan continued to press Moore, asking him whether Trump's assertions his father was born in Germany and his wife got along well with North Korean leader Kim Jong UnKim Jong UnActivity seen at North Korean missile research center: report South Korea and the billion mustache North Korea replaces its foreign minister: report MORE were exaggerations or lies.