No word yet if there is any comment from the White House. However, there are several possibilities which reports suggest they may be working on -- 1) the initial rift occurred during the Obama Administration, 2) it is a China hoax, 3) this can't be related to Global Warming since ice is cold, 4) just like the U.S. broke off from the Paris Accord, icebergs break off land masses, it happens, 4) our hearts and prayers go out to Antarctica which lost such a close land mass, and 5) Fake News.
Another possibility. The president was not informed of this beforehand and had no awareness of the situation until it was reported. But it is a quality iceberg. And being made of ice, the president is impressed how transparent it is.