Trump ramps up feud with San Juan mayor ahead of Dorian

PHOTO: President Donald Trump walks on the South Lawn of the White House after returning from a trip to Kentucky, in Washington, Aug. 21, 2019.PlayTasos Katopodis/Reuters, FILE
WATCH Puerto Rico under state of emergency for Tropical Storm Dorian

With a hurricane watch now in effect for Puerto Rico, President Donald Trump on Wednesday insulted San Juan Mayor Carmen Yulin Cruz, before proclaiming himself “the best thing that’s ever happened to Puerto Rico.”

PHOTO: President Donald Trump speaks to the media in the Oval Office of the White House, July 26, 2019. Brendan Smialowski/AFP/Getty Images
President Donald Trump speaks to the media in the Oval Office of the White House, July 26, 2019.

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The president initially tweeted a prediction that the Federal Emergency Management Agency, or FEMA, and others will do "a great job" responding to Tropical Storm Dorian in Puerto Rico and “When they do, let them know it, and give them a big Thank You - Not like last time.”

PHOTO: San Juan mayor Carmen Yulin Cruz talks to the media in San Juan, Puerto Rico, Oct. 2, 2017. Los Angeles Times via Getty Images, FILE
San Juan mayor Carmen Yulin Cruz talks to the media in San Juan, Puerto Rico, Oct. 2, 2017.

With Trump calling Yulin Cruz, a Democrat, “incompetent,” and the mayor on Tuesday urging Trump to “get out of the way,” the adversaries have reignited a feud dating back to the wake of Hurricane Maria.

In a second Twitter thread later Wednesday morning, Trump proclaimed himself “the best thing that’s ever happened to Puerto Rico!”

PHOTO: Tropical Storm Dorian bears down on Puerto Rico in a satellite image from NOAA captured on Aug. 28, 2019. NOAA
Tropical Storm Dorian bears down on Puerto Rico in a satellite image from NOAA captured on Aug. 28, 2019.

FEMA announced late Wednesday morning that the president signed an emergency declaration for Puerto Rico, making federal emergency aid available there to supplement the local response and authorizing FEMA "to identify, mobilize, and provide at its discretion, equipment and resources necessary to alleviate the impacts of the emergency."

On Tuesday, Trump made the false claim that Congress had approved $92 billion for the U.S. territory after Hurricane Maria devastated the island in 2017.

Congress has allocated only about $42 billion -- and only a smaller portion of that has been spent. But Trump and the White House have repeatedly used the $92 billion figure -- based, they say, on a government estimate of how much recovery money the island could need over 20 years.

ABC News' Elizabeth Thomas contributed to this report