PHILADELPHIA — A new CNN/ORC national poll has Donald Trump in the lead by 5 points, a sign of a post-convention bump for the Republican nominee.

Trump is ahead of Clinton 44-39, the poll said. A separate Morning Consult poll released Monday showed the GOP nominee edging Clinton by 4 percentage points.

No Republican presidential nominee since President George W. Bush in 2000 has seen a post-convention surge in CNN polls as big as Trump's.

As Democrats seek to unify their party in the wake of new concerns about party leaders' working to help Clinton throughout the primary, the CNN/ORC survey raises new questions about Clinton's ability to win over independent voters.

Trump carries an 18-point lead over Clinton among independents in the survey, 43 percent of whom indicated they were more likely to back him in November after watching the speech he delivered on the final night of the GOP convention. Heading into last week's confab in Cleveland, 34 percent of independents supported Clinton and 31 backed Trump.

The billionaire businessman has also seen a post-convention bump in his favorability rating. A poll taken before Republicans gathered in Cleveland showed 39 percent of voters holding a positive view of Trump. His favorability rating has since risen to 46 percent and he leads Clinton by double digits when voters were asked which candidate they trust more to handle terrorism and the economy.

The CNN/ORC survey of 1,001 U.S. adults was conducted between July 22-24. Results contain a margin of error plus or minus 3.5 percentage points.