George Conway, a lawyer who’s married to White House counselor Kellyanne ConwayKellyanne Elizabeth ConwayTrump embarks on Twitter spree amid impeachment inquiry, Syria outrage The Hill's Campaign Report: Biden camp faces new challenges Trump offers condolences on frequent foe Cummings: 'Very hard, if not impossible, to replace' MORE, on Thursday analyzed outgoing Defense Secretary James MattisJames Norman MattisAmash rips Trump over move to send troops from Syria to Iraq Defense chief says US troops leaving Syria will go to western Iraq White House staggers after tumultuous 48 hours MORE’s resignation letter, saying it included “not a word of praise” for President TrumpDonald John TrumpZuckerberg launches public defense of Facebook as attacks mount Trump leaning toward keeping a couple hundred troops in eastern Syria: report Warren says making Israel aid conditional on settlement building is 'on the table' 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.