George Conway, a lawyer who’s married to White House counselor Kellyanne ConwayKellyanne Elizabeth ConwayKellyanne Conway knocks Biden, talks up Sanders in Wash Post op-ed Democrats sharpen case on second day of arguments 'Emotion' from Trump's legal team wins presidential plaudits MORE, on Thursday analyzed outgoing Defense Secretary James MattisJames Norman MattisLawmakers push back at Pentagon's possible Africa drawdown Overnight Defense: Book says Trump called military leaders 'dopes and babies' | House reinvites Pompeo for Iran hearing | Dems urge Esper to reject border wall funding request Trump called top military brass 'a bunch of dopes and babies' in 2017: book MORE’s resignation letter, saying it included “not a word of praise” for President TrumpDonald John TrumpSchiff pleads to Senate GOP: 'Right matters. And the truth matters.' Anita Hill to Iowa crowd: 'Statute of limitations' for Biden apology is 'up' Sen. Van Hollen releases documents from GAO investigation MORE.

Mattis announced on Thursday that he would resign because Trump deserved a secretary "whose views are better aligned with yours."

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Conway tweeted that the resignation letter lacked the usual pleasantries and the absence of praise “speaks volumes.”

“No pro forma ‘it has been a privilege to have worked with you to [something],’ or formulaic ‘I am proud that we were able to [fill in here]’—or even the usually obligatory ‘thank you for giving me the opportunity to serve,’” Conway noted.

The nicest line in the letter was the opening, “Dear Mr. President,” he added.

Mattis’s announcement came a day after the White House announced the U.S. would be withdrawing its troops from Syria. Additional reports suggest a decrease in the number of troops serving in Afghanistan.

Pentagon officials have reportedly pushed back against the decision.

“General Jim Mattis will be retiring, with distinction, at the end of February, after having served my administration as Secretary of Defense for the past two years," Trump tweeted on Thursday.

Conway's frequently criticizes Trump and the administration on Twitter, earning him national attention given his wife's senior position in the White House.