FILE PHOTO: U.S. Secretary of Defence James Mattis attends a news conference at Libertador Building in Buenos Aires, Argentina August 15, 2018. REUTERS/Martin Acosta

WASHINGTON (Reuters) - U.S President Donald Trump said on Wednesday Defense Secretary James Mattis will remain in his job, a day after a report, denied by Mattis, that he had made disparaging remarks about the president.

Asked by reporters at the White House whether he was considering replacing Mattis, Trump said: “He’ll stay right there. We’re very happy with him. We’re having a lot of victories.”

Mattis was quoted as having told associates that Trump acted like “a fifth- or sixth-grader,” in excerpts published by the Washington Post of a book by Watergate reporter Bob Woodward.

According to the book, “Fear: Trump in the White House,” the Republican president told Mattis he wanted to have Syrian President Bashar al-Assad assassinated after Assad launched a chemical attack on civilians in April 2017.

Mattis told Trump he would “get right on it,” but instead developed a plan for a limited air strike that did not threaten Assad personally, according to the excerpts.

Mattis issued a statement dismissing the book as “a uniquely Washington brand of literature” and saying the contemptuous words about Trump attributed to him “were never uttered by me or in my presence.”