The survey, conducted Jan. 11-14, found the president’s core support currently at 23 percent. That’s the share of voters who said they’d definitely vote to keep him in office for another term. Twelve percent said they’d probably vote to re-elect the president.

The majority of Republicans (54 percent) – including most of those who voted for Trump in 2016, Republican candidates in the midterms and half of those who picked Republican presidential nominee Mitt Romney in 2012 – are still solidly behind the president.

Still, some cracks were apparent: Less than half (46 percent) of self-described conservatives, for example, said they’d definitely vote for Trump in 2020. What’s more, 17 percent of those voters said they’d definitely vote for someone else.

Among registered voters who said they didn’t vote in 2016, 42 percent would definitely back someone else, compared with 19 percent who would definitely back Trump.

To be sure, Trump has emerged victorious before when his ceiling with voters appeared even lower. In August 2016, Morning Consult asked a slightly different question about voting intentions: Instead of allowing respondents to say they would “probably” vote for Trump, voters could respond by saying they would “consider” voting for him.