More than two-thirds of U.S. adults believe President Trump's use of Twitter is inappropriate and that he is not acting as a positive role model, according to an ABC News/Washington Post poll released Monday morning.

The July 10-13 survey found 70 percent of people asked say Trump has acted in an "unpresidential" manner since the inauguration six months ago. Only 24 percent say his image and behavior as president is "fitting and proper."

Among Republicans, 38 percent say Trump's conduct has been unpresidential.

Only 21 percent of all adults say Trump's tweets are "refreshing," while 52 percent think they are "dangerous."

Trump's overall approval ratings hit a record-low of 36 percent, according to the ABC poll.

A Bloomberg survey released Monday gave Trump a 40 percent approval rating. The majority of U.S. adults, 55 percent, do not like Trump's work, up 12 points since December.

Trump's handling of the economy received the best score, as 46 percent of adults approved and 44 percent disapproved.

The ABC poll was taken by landline and cell phone with 1,001 randomly selected adults nationwide and had a 3.5 percentage point margin of error.

The Bloomberg survey was taken by phone with 1,001 U.S. adults and had a 3.1 percentage point margin of error.