Donald TrumpDonald John TrumpTrump says he will 'temporarily hold off' on declaring Mexican drug cartels as terror organization House Judiciary Committee formally receives impeachment report Artist behind gold toilet offered to Trump sells banana duct-taped to a wall for 0,000 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 ClintonYang expands campaign with senior hires for digital operations Top GOP legislator in California leaves party GOP senators request interview with former DNC contractor to probe possible Ukraine ties 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 RyanHouse Ethics Committee informs Duncan Hunter he can no longer vote after guilty plea Duncan Hunter pleads guilty after changing plea Trump campaign steps up attacks on Biden 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.