Americans are nearly split between their choice of Trump or Clinton; her margin over Trump narrows from five points last week to three points this week to 48 per cent to 45 per cent," NBC News/Survey Monkey said as it released its latest weekly online tracking poll.
Trump emerged as the Republican Party's presumptive presidential nominee after his massive victory in the Indiana primary elections early this month.
Given her advantage in the delegate count, she is expected to reach that stage soon, political analysts feel.
Releasing its weekly online tracking poll ahead of the primaries in Oregon and Kentucky, NBC News/Survey Monkey said Clinton has a massive 75 points lead over Trump when it comes to Black voters and 37 points lead among Hispanics.
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On the other hand, Trump leads Clinton by 14 points among white voters.
However, Trump trails Clinton by 15 points among women voters, it said.