White House chief of staff John Kelly John Francis KellyMORE ripped into Massachusetts Sen. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D) in an email to a staffer last year after a conversation with the senator concerning President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's travel ban, BuzzFeed reports.

In an email chain following a conversation with Warren about several constituents detained in Boston's Logan Airport under the travel ban despite having visas, Kelly, then the Secretary of the Department of Homeland Security, described Warren as "arrogant" and "impolite" to a subordinate.

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“Absolutely most insulting conversation I have ever had with anyone,” wrote Kelly in the email obtained by BuzzFeed News.

"What an impolite arrogant woman. She immediately began insulting our people accusing them of not following the court order, insulting and abusive behavior towards those covered by the pause, blah blah blah," he added, apparently mocking Warren's concerns.

Kevin Carroll, the department's senior counsel, responded. “Too bad Senate Majority Leader McConnell couldn’t order her to be quiet again!" he said, referring to Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE's (R-Ky.) use of Senate rules to silence the senator during a speech, a moment that quickly went viral.

"Warren is running for president so early, trying too hard, and chasing bad pitches,” Carroll added.

Warren's office and the White House did not immediately respond to requests for comment Thursday night on the emails. Kelly would be named White House chief of staff following the exit of Reince Priebus Reinhold (Reince) Richard PriebusLeaked audio shows Trump touted low Black voter turnout in 2016: report Meadows joins White House facing reelection challenges Trump names Mark Meadows as new chief of staff MORE in July of that year.

The Massachusetts Democrat is a frequent target of Trump, who often attacks the liberal senator with the racially-charged "Pocahontas" epithet referring to her claims of Native American ancestry.