"I never thought the President of the United States would tweet something like this out," said Rep. Ruben Gallego (D-AZ). "What an embarrassment for this country."
Mr. Trump also brought up one of his most common Twitter themes, his criticism of the Russia investigation, using his term "witch hunt" for the first time in almost a month.
"Where is Jeff Sessions?" the President asked in another tweet related to the Russia probe, taking another dig at his U.S. Attorney General.
The President also continued to tangle with Sen. Warren, a day after she issued the results of a DNA test, which she says confirms that she has Native American blood lines in her distant family tree.
Many Republicans were thoroughly enjoying the President's jabs at Warren, who fired back at Mr. Trump as well.
"You've lost a step, and in 21 days, you're going to lose Congress," Warren tweeted.
Asked later in the day by the Associated Press about the "Horseface" tweet about Daniels, the President defended it, saying simply, "You can take it any way you want."
The tweets by the President ended a fairly calm period for Mr. Trump, who had been shying away from his favorite social media platform, and doing more interviews and campaign rallies.
It also came on a day in which the White House listed no events on the President's schedule.