Trump leads Clinton, 42 to 39 percent, in Florida in the latest Quinnipiac University poll . That's an 11-point swing from last month, when Clinton led 47 to 39 percent.

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Trump has also retaken the lead from Clinton in Pennsylvania, where he is now up 43 to 41 percent. Last month, Clinton held a slim lead, 42 to 41 percent.

The pair remains tied in Ohio, where Republicans will gather to formally nominate Trump at the Republican National Convention in Cleveland next week. Trump and Clinton each get 41 percent apiece there. In the poll last month, each won 40 percent.

The shift in the polls comes after a tough week on the campaign trail for Clinton, who dodged criminal charges from the FBI over her use of a private email server while secretary of state but was criticized harshly by FBI Director James Comey.

Clinton has had difficulty in winning over voters throughout the election, and Comey's remarks were further ammunition for Trump and Republicans to attack her trustworthiness.

"While there is no definite link between Clinton's drop in Florida and the U.S. Justice Department decision not to prosecute her for her handling of e-mails, she has lost ground to Trump on questions which measure moral standards and honesty," said Peter A. Brown, assistant director of the Quinnipiac University Poll.

The figures come ahead of Trump's expected announcement of a running mate pick later this week and as he attempts to unify a reticent GOP ahead of the party's convention. Clinton is also expected to announce her VP pick soon.