Trump now has the support of 45 per cent of the prospective general election voters against Clinton's 43 per cent in the poll carried out by CNN/ORC.
Libertarian Gary Johnson has support of seven per cent of likely voters and Green Party's Jill Stein has just two per cent, according to the poll.
This is for the first time after the two back-to-back conventions that Trump is seen leading in a major national poll, albeit by a small margin.
Trump made course correction by appointing a new campaign head, giving policy speeches and delivering his remarks from teleprompters.
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According to RealClearPolitics.Com, which keeps track of all major national polls, Clinton maintains an average lead of 3.3 percentage points.
This was around eight per cent about five weeks ago.
Most recently, Clinton's convention propelled her to an 8-point lead among registered voters in an early-August CNN/ORC Poll.
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Meanwhile, a separate NBC News poll released today hours later showed Clinton with a six point lead over Trump.
However, in a four-way match that includes Johnson (12 percent) and Stein (four per cent), Clinton (41 per cent) has a four-point lead over Trump (37 per cent).