An overwhelming majority of Democratic voters say President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE’s frequent use of Twitter should be a focus of White House hopefuls in the 2020 campaign season, according to a new Hill-HarrisX poll.

The nationwide survey found that 69 percent of likely Democratic voters said Trump’s Twitter usage should be a campaign issue, compared to 31 percent in that group who disagreed.

A majority of independent voters, 55 percent, also said the president's social media habits should be debated on the campaign trail. Forty-five percent said Democratic candidates shouldn't make an issue of it.

Thirty-six percent of GOP voters said 2020 Democrats should focus on Trump's Twitter usage, while 64 percent said they shouldn't.

Trump has used Twitter to make policy announcements, attack his critics and communicate with his base.

His tweets have often sparked backlash, usually from his opponents but sometimes from his supporters as well.

The president recently came under fire for his Twitter attacks on a group of freshman lawmakers known as "The Squad," telling the four minority congresswomen that they should “go back” to where they came from, even though all four are U.S. citizens and only one was born outside the country.

Trump also lashed out at Denmark's prime minister last week after she dismissed Trump’s suggestion of purchasing Greenland, calling her response “nasty.”

Most recently, the president used Twitter to criticize San Juan Mayor Carmen Yulín Cruz after she said Trump should "get out of the way" and let others prepare for Hurricane Dorian, which is approaching the island.

Trump hit back by alleging “Puerto Rico is one of the most corrupt places on earth.”

“Their political system is broken and their politicians are either Incompetent or Corrupt,” Trump tweeted, adding that he was “the best thing that’s ever happened to Puerto Rico.”

The Hill-HarrisX poll surveyed 660 Democratic and independent voters. It has a margin or error of plus or minus 5.5 percentage points.

—Tess Bonn