Sen. Elizabeth Warren, D-Mass., accused President Trump of "playing politics" with the lives of residents of Puerto Rico who are facing limited access to food, water and medicine in the wake of Hurricane Maria.
"PR is in CRISIS. US citizens are dying. Millions of people need their govt's help. Stop playing politics with their lives, @realDonaldTrump," Warren tweeted.
Warren also said she spoke with San Juan Mayor Carmen Yulin Cruz and praised her work with recovery efforts.
"I just got off the phone with Mayor @CarmenYulinCruz. I told her to keep up her heroic work & leadership on behalf of Puerto Rico," she said in a second tweet.
Trump sent multiple tweets Saturday criticizing Cruz and said she displayed poor leadership.
But Warren said Trump was being a bad leader by spending the weekend at his golf club in Bedminster, N.J., instead of working on the federal government's response to Puerto Rico.
"The definition of "poor leadership" is sitting at your golf club while millions of US citizens beg for your help, @realDonaldTrump," she tweeted.
Cruz said the federal government was moving too slow with its response to Hurricane Maria, which devastated the island last week.
Half of Puerto Rico's population doesn't have access to drinking water, and the U.S. territory is expected to be without power for several months.