P.J. TOBIA:

Today, the president tweeted: "We cannot keep FEMA, the military and the first-responders in Puerto Rico forever."

The president has also repeatedly traded verbal fire with San Juan Mayor Carmen Yulin Cruz. She's publicly criticized the federal response as too slow.

In her own tweet today, Cruz slammed Mr. Trump's latest words as unbecoming of a commander in chief. She said he seemed to be acting more as a hater in chief.

Puerto Rico's governor, Ricardo Rossello, has generally made approving statements of the federal effort. Today, in response to the president, he tweeted: "The U.S. citizens in Puerto Rico are requesting the support that any of our fellow citizens would receive across our nation."

Later, the White House chief of staff, General John Kelly, addressed the dust-up.

JOHN KELLY, White House Chief of Staff: Our country will stand with those American citizens in Puerto Rico until the job is done, but the tweet about FEMA and DOD, read, military, is exactly accurate. They are not going to be there forever.