The latest Gallup poll found that only 45 percent of Americans trust Trump to do what he promises, which is down substantially from the last time the question was asked in February, when 62 percent of Americans said the president keeps his promises - a decline of 17 percent.
The Gallup poll, which has a 4 percent margin of error, is based on telephone interviews of about 1,019 US adults conducted April 5-9. People were less likely to answer that the president "can bring about the changes this country needs" and that he is "honest and trustworthy".
Eighty-one percent of Republicans say he keeps his promises but it was even higher in February at 92 percent.
"Regardless of whether they agreed with those actions, Americans appeared to take them as evidence Trump was keeping his campaign pledges to fundamentally alter the course of the federal government", Gallup's Jim Norman wrote in a press release.
In a write-up of the results, Gallup explained that the numbers came after Trump's defeat over repealing the Affordable Care Act, as supporters have become unhappy he hasn't done more on taxes and immigration while detractors are upset he hasn't protected middle- and working-class Americans.
According to Gallup, Trump's approval rating dropped two percentage points from when the February poll was conducted to when the April poll was done, from 42 per cent to 40 per cent.
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Forty-eight percent say low-income earners are paying too much.
After Republicans won control of the White House and both houses of Congress, 61 percent of Americans told the Pew Research Center in December that they were very or somewhat confident that Trump could work with the House and Senate. But the declines have been greater among subgroups that tend to be less supportive of Trump, including Democrats, liberals, women and young adults.
Most Americans have viewed Trump unfavourably since before his inauguration and continue to do so almost 90 days into his term in office. In February, almost two-thirds said they thought the president keeps his promises and now only 40 percent believe he does.
On the home front President Trump has thus far failed to deliver on his campaign promise to repeal and replace Obamacare.
The president has also lost ground on five other characteristics.