A new national poll released this week shows that Trump supporters increasingly feel that he's "going too far," is falling short of their expectations of him for unifying the country, and is "getting sidetracked by things that aren't important." All of which amounts to an uptick in "Trump Regretters" (i.e. people who voted for him but no longer support him) since November.

But a majority of Trump supporters still feel the President is "keeping his promises" and "getting things done."

Last month, half of Trump voters felt he was "surrounding himself with the best people." This week, 39 percent do.

But Trump-who last month tweeted "Any negative polls are fake news"-may have cause for concern if support among his base continues to fall, said Margie Omero, executive vice president for public affairs at PSB Research, who spearheaded the poll.

"He has no crossover appeal," Omero told MarieClaire.com, citing other polling outlets that have found Trump to be strong with his supporters, but dangerously weak with Democrats and independents. "So if he starts to slip with his base-as he has in our poll-where does he have room to grow?"

"He has to hold onto his base going into the midterms," she added. "If this slide continues, he is going to have some serious trouble."