Sen. Elizabeth Warren Elizabeth WarrenJudd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report Biden's fiscal program: What is the likely market impact? MORE (D-Mass.) said Saturday she spoke on the phone with San Juan Mayor Carmen Yulín Cruz, praising the mayor for her work in Puerto Rico's recovery effort.

"PR is in CRISIS. US citizens are dying. Millions of people need their govt's help," Warren wrote on Twitter while calling on President Trump to "stop playing politics with their lives."

"I just got off the phone with Mayor @CarmenYulinCruz. I told her to keep up her heroic work & leadership on behalf of Puerto Rico," Warren continued.

PR is in CRISIS. US citizens are dying. Millions of people need their govt's help. Stop playing politics with their lives, @realDonaldTrump. — Elizabeth Warren (@SenWarren) September 30, 2017

I just got off the phone with Mayor @CarmenYulinCruz. I told her to keep up her heroic work & leadership on behalf of Puerto Rico. — Elizabeth Warren (@SenWarren) September 30, 2017

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Warren spoke to Cruz after Trump lashed out at the mayor on Twitter early Saturday, blasting her "poor leadership." Trump's attack came a day after Cruz criticized his administration's response in Puerto Rico during an emotional plea for more federal help for the storm-ravaged island.

The Mayor of San Juan, who was very complimentary only a few days ago, has now been told by the Democrats that you must be nasty to Trump. — Donald J. Trump (@realDonaldTrump) September 30, 2017

...Such poor leadership ability by the Mayor of San Juan, and others in Puerto Rico, who are not able to get their workers to help. They.... — Donald J. Trump (@realDonaldTrump) September 30, 2017

...want everything to be done for them when it should be a community effort. 10,000 Federal workers now on Island doing a fantastic job. — Donald J. Trump (@realDonaldTrump) September 30, 2017

Puerto Rico is in the process of recovering from Hurricane Maria, which left the island without power earlier this month.

Aid, such as food, water and medicine, has been slow to get to the island's residents, stoking anger toward the federal government.

Cruz had issued an emotional plea for help on Friday, and criticized the federal government's response to the crisis.

"I will do what I never thought I was going to do. I am begging, begging anyone who can hear us to save us from dying. If anybody out there is listening to us, we are dying, and you are killing us with the inefficiency," Cruz said.