Trump made the false claim in response to a question from a reporter about why he hasn't yet commented on the attack that led to the soldiers' deaths.
"I have written them personal letters, they have been sent or they're going out tonight but they were written over the weekend".
Trump himself failed to support his own assertion later in the press conference, when he was asked how he could claim to know whether Obama did or did not call grieving military families.
Defense Secretary James Mattis said the rescue was timely stating: "I completely reject the idea that that was slow".
"That's what I was told".
Trump's suggestion that his predecessors rarely called the families of the fallen, quickly drew the ire of many on social media, including Alyssa Mastromonaco, a former White House deputy chief of staff in the Obama administration. Excuse me, Peter. I do a combination of both. The White House countered at the time, saying that the president personally signs every letter. I like when I can the combination of a call and also a letter, ' the president explained.
"When American heroes make the ultimate sacrifice, Presidents pay their respects", she continued.
Officials said the 12 man Green Beret-led team had just completed a meeting with local leaders and were walking back to their unarmored pick-up trucks when the unexpected ambush resulted in a firefight that lasted 30 minutes until French Mirage jets arrived overhead to fly low passes in an attempt to disperse the attackers.
"This president, like his predecessors, has done each of these". Initially, Trump said he had the facts about what previous presidents did, then Trump said he didn't have the facts and it's the generals' fault if he claims were wrong.
The four Green Berets were killed during a October 1 raid in Niger.
"To say President Obama (or past presidents) didn't call the family members of soldiers KIA - he's a deranged animal", Mastromonaco tweeted, using the acronym for "killed in action". So generally I would say that I like to call.
He also raised the issue of Trump's criticisms a year ago of Khizr Khan, the father of a fallen Muslim American soldier named Humayun Khan, who spoke at the Democratic National Convention.
'I'm going to be calling them. He added: "It gets to the point where you make four or five a day, it's a very tough day, and for me, that's by far the toughest".