A growing majority of Americans no longer trust President Donald Trump to keep his promises, a new poll by Gallup has revealed.

The survey detailed the public's declining faith in the president's performance, with people less likely to view him as a 'strong and decisive leader' or as 'honest and trustworthy'.

Only 36 per cent of respondents believe the president is honest and trustworthy, down from 42 per cent in February.

The poll, which was conducted on April 5-9, shows that only 45 per cent of Americans believe that Trump 'keeps his promises'. The results mark a 17-point decline from February, when 62 per cent of Americans believed President keeps his promises.

A small majority of Americans view Trump as a 'strong and decisive leader', at 52 per cent, a seven-point drop from February's 59 per cent result.

Fewer than 50 per cent of the people think that Trump 'can bring about changes this country needs' (46 per cent), 'cares about the needs of people like you' (42 per cent), or 'can manage the government effectively' (41 per cent).

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.

Gallup noted that the biggest shifts in perception occurred among groups that are less supportive of Trump, including Democrats, 'liberals', young adults and women. Among those who do not approve of Trump, only 11 per cent say he keeps his promises — down from 35 per cent in February. The greatest drop in approval ratings was among women, from 65 per cent in February to 40 per cent in April.

Overall, Trump saw a drop across the board in people who trust him to keep his promises: men, Republicans, older adults and conservatives all saw between eight per cent and 12 per cent drop in confidence.