From Ted McLaughlin at jobsanger:
This is one reason Trump’s approval rating remains so low. About 51% of the public thinks he says incorrect (untrue) things most or all of the time, and another 24% believe he does it sometimes. Only a tiny 15% say he rarely or never says incorrect (untrue) things.
And 39% (nearly four out of 10 people) believes he does that lying intentionally, while 24% believes it is an accident (i.e., he is too ignorant of the facts to get them correct).