Trump’s disapproval rating has increased 6 points in the last 4 days, according to the poll. As of Jan. 28, about 51% of Americans polled disapproved of Trump, up from 45% on Jan. 22 — six days prior to the most recent results. By contrast, about 42% approve of the job he’s doing, a more moderate change compared to the 45% who approved of him on Jan. 22.

To obtain its results, Gallup surveys about 1,500 adults daily via telephone, and has a margin of error of plus or minus three percentage points.

Trump’s ratings are well below those of his two most recent predecessors, Presidents George W. Bush and Barack Obama. According to a previous Gallup poll, at the beginning of February of 2001, 57% of people polled approved of Bush, and 25% disapproved. In the first few days of his presidency in Jan. 2009, Obama had a 68% approval rating, and a modest 12% disapproval rating.

The most recent results come after Trump set the record for receiving the lowest initial job approval rating and the highest disapproval rating just days after his inauguration—making him the first U.S. president to begin with a rating below 50% in the history of Gallup surveys. At the time, about 90% of Republicans surveyed approved of Trump, while 81% of Democrats disapproved, according to previous report.