WASHINGTON -- U.S. President Donald Trump is paying tribute to his late mother, Mary MacLeod, in a Mother's Day video posted to his Twitter account.

Trump says, "So much of what I've done and so much of what I've become is because of my mother. I miss her a lot."

, the mother of the couple's 12-year-old son, Barron. The president and first lady held a Mother's Day event at the White House Wednesday recognizing military mothers and spouses.

In the video, Trump notes his mother came to the United States from Scotland and was married to his father, the late Fred Trump, for many years.

Trump says his mother was "warm, loving, really smart," adding she "could be tough if she had to be."