The complete quote, which you selectively abbreviated and "interpreted", was, "I mean, you could ask General Kelly. Did he get a call from Obama? You could ask other people. I don't know what Obama's policy was. I write letters, and I also call."

Trump's statement, that he write letters AND calls, has been proven to be a lie.

Here's one example, reported by Time, that exposes Trump's lie: "After her Army son died in an armored vehicle rollover in Syria in May, Sheila Murphy says, she got no call or letter from President Donald Trump, even as she waited months for his condolences, wrote to him to say "some days I don't want to live," and still heard nothing."