Democratic presidential candidate Hillary Clinton holds a modest but solid lead over her Republican rival Donald Trump, according to three latest polls released ahead of the Republican party’s national convention here.

The edge for Clinton, who seeking to become the first female US president, ranged from four to seven percentage points over Trump, the billionaire real estate mogul set to claim the Republican nomination this week.

The ABC/ The Washington Post survey gave Clinton an advantage of four points over Trump.

The real estate tycoon was seen trailing by seven points in the CNN/ORC International Pol .

In the ABC News / The Wall Street Journal the former Secretary of State leads by five percentage points.

RealClearPolitics.Com which maintains all major national polls, said Clinton is leading Trump by 3.2 per cent in an average of major national polls.

But both remain unpopular. The ABC/Post survey said 58 per cent of voters say they are dissatisfied with their choice between Clinton, the wife of former President Bill Clinton, and Trump, the one-time television reality show host. It said 64 per cent view Trump unfavorably, with 54 per cent looking negatively at Clinton.

The pre-convention polls give Clinton a lead that has declined only slightly through a tumultuous July that began with FBI Director James Comey accusing the former secretary of state of being “extremely careless” with her use of a private email server while at the State Department, though Comey recommended no charges.

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