Another 6pct support Libertarian candidate Gary Johnson and 2pct support the Green Party candidate Jill Stein.
In a mid-October, the poll conducted by The Wall Street Journal /NBC News, Clinton had a commanding lead of 11pct points.
The drop of 7pct points is seen as an effect of the decision of the FBI last week to re-open its investigation against her alleged email scandal, following which the popularity of Trump has surged.
"Much of the change from mid-October comes from Trump winning an increased share of the vote within his own party, which brought him on par with Clinton's support among Democrats," The Wall Street Journal said.
The poll was conducted between November 3 and 5 among 1,282 likely voters.
It has a margin of error of plus or minus 2.73pct points.
According to RealClearPolitics, Clinton is leading by 1.8pct points in its latest average of major national polls.
According to Politico/ Morning Consult poll released on Sunday, Clinton is leading by just three points and is supported by 45pct of the likely voters.
"While our final poll before the election shows a tight race, Clinton has maintained her small lead in our polling for weeks now," said Morning Consult co-founder and chief research officer Kyle Dropp.
"There is little that could swing voters now in the final hours leading up to Election Day," Dropp said.
The poll surveyed 1,482 likely voters and has a margin of error of plus or minus 3pct points.
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