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A remark made by President Trump at his press conference Monday drew the ire of President Obama's former deputy chief of staff.

Trump was asked about his reaction to four Green Berets who were killed in an ambush in the African nation of Niger by suspected Islamic militants.

Trump was not present at Dover Air Force Base, Del. when their remains were returned, but said he hand-wrote letters to their families and planned to call them after giving sufficient time to mourn.

"President Obama and other presidents, most of them didn't make calls. A lot of them didn't make calls [to families]," Trump initially said.

Obama aide Alyssa Mastromonaco tweeted that Trump's statement was "a f***ing lie," calling him a "deranged animal."

Trump later clarified to say that past presidents didn't always contact families or adequately acknowledge deaths of servicemembers 100 percent of the time.

"That's what I was told. All I can do is ask my generals," he said. "I like, when I can, the combination of a call and also a letter."

Mastromonaco also appeared to compare Trump to North Korean dictator Kim Jong Un, saying that Sen. Mitch McConnell (R-Ky.), who spoke with Trump at the presser, had "pledged his allegiance to Dear Leader."

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