Kelly called Warren 'impolite,' 'arrogant:' report

White House chief of staff John KellyJohn Francis KellyMORE ripped into Massachusetts Sen. Elizabeth WarrenElizabeth Ann WarrenKamala Harris: Trump administration ‘targeting’ California for political purposes Harry Reid says he won’t make 2020 endorsement until after Nevada caucus Gillibrand to appear on Fox News Monday night MORE (D) in an email to a staffer last year after a conversation with the senator concerning President TrumpDonald John TrumpSchiff urges GOP colleagues to share private concerns about Trump publicly US-China trade talks draw criticism for lack of women in pictures Overnight Defense: Trump to leave 200 troops in Syria | Trump, Kim plan one-on-one meeting | Pentagon asks DHS to justify moving funds for border wall 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 McConnellAddison (Mitch) Mitchell McConnellOvernight Energy: Trump ends talks with California on car emissions | Dems face tough vote on Green New Deal | Climate PAC backing Inslee in possible 2020 run Poll: 33% of Kentucky voters approve of McConnell Five takeaways from McCabe’s allegations against Trump 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 PriebusReinhold (Reince) Richard PriebusIs a presidential appointment worth the risk? Ex-White House aide says 'cartoon villain' Kellyanne Conway bad-mouthed colleagues Trump Org hires former WH ethics lawyer to deal with congressional probes 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.