Donald TrumpDonald John TrumpUSAID administrator tests positive for COVID-19 Kamala Harris, Stacey Abrams among nominees for Time magazine's 2020 Person of the Year DOJ appeals ruling preventing it from replacing Trump in E. Jean Carroll defamation lawsuit MORE on Thursday joked that he'll be taking a "nice long vacation" if his poll numbers don't go up by November.

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"I just keep doing the same thing I'm doing right now," the GOP presidential nominee said when asked on CNBC how he would close the gap in battleground states where he is trailing Democrat Hillary ClintonHillary Diane Rodham ClintonFederal workers stuck it out with Trump — now, we're ready to get back to work Biden soars as leader of the free world Intercept DC bureau chief says Biden picks are 'same people' from Obama years MORE.

"And at the end, it's either going to work or I'm going to have a very, very nice long vacation."

Support for Trump has been dropping in polls following last month's Democratic National Convention, and he trails Clinton both nationally and in several battleground states.

Clinton has 48 percent support nationally to Trump's 40.3 percent in the RealClearPolitics average

Trump has created several controversies in recent weeks. He faced bipartisan criticism for his attacks on the family of Humayun Khan, an Army captain killed in Iraq in 2004.

Trump last week declined to endorse Speaker Paul RyanPaul Davis RyanPaul Ryan calls for Trump to accept results: 'The election is over' Bottom line Democratic anger rises over Trump obstacles to Biden transition MORE (Wis.) and other top Republican lawmakers before eventually backing them days later.

And earlier this week, he drew criticism after suggesting that gun rights supporters could take action against Clinton, a remark many took as advocating violence.