The percentage of voters who remain so dissatisfied with Hillary Clinton and Donald Trump that they plan to skip the ballot box on election day has declined since both parties held their nominating conventions.

A Rasmussen Reports survey released Tuesday found that 15 percent of voters still intend to sit this election out because they dislike their options, down 9 percentage points since late April, shortly before Trump and Clinton became the presumptive nominees of their respective political parties.

The survey comes amid new polls that show a tight race between Clinton and her Republican opponent in a handful of battleground states, and new accusations by Trump that the general election may be "rigged."

Trump and Clinton each received a bounce between 7-8 percentage points following their parties' national conventions last month, giving the former secretary of state a 4-point edge over Trump in the latest RealClearPolitics national polling average.

A separate survey published on Monday found that voters saw the Democratic convention as benefitting Clinton more than the GOP convention helped Trump.

The survey of 1,000 U.S. voters was conducted between July 28-31. Results contain a margin of error plus or minus 3 percentage points.