President TrumpDonald John TrumpDemocrats slide in battle for Senate Trump believes Kushner relationship with Saudi crown prince a liability: report Christine Blasey Ford to be honored by Palo Alto City Council MORE on Thursday night dismissed former President Obama's reemergence on the campaign trail ahead of the November midterm elections, arguing it could fire up his own base.

“By the way, he’s campaigning again. That’s good news. When I was running, I swear, I thought he campaigned harder than Hillary ClintonHillary Diane Rodham ClintonO'Rourke's rise raises hopes for Texas Dems down ballot Gabbard considering 2020 run: report Claiming 'spousal privilege' to stonewall Congress MORE. And we won big,” Trump said at a rally in Las Vegas on Thursday evening.

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Obama burst back onto the scene earlier this month in a speech in Illinois that included blistering rebukes of Trump’s performance while in office on everything from his tax plan to his response to the deadly white nationalist rally in Charlottesville, Va., last year.

The former president also travelled to California to rally for several House candidates, including some running in Republican-held districts, and Ohio to campaign with Democratic gubernatorial candidate Richard CordrayRichard Adams CordrayDems go on offense against GOP lawsuit on pre-existing conditions Trump attacks Democrat in Ohio governor's race Election Countdown: Minnesota Dems worry Ellison allegations could cost them key race | Dems struggle to mobilize Latino voters | Takeaways from Tennessee Senate debate | Poll puts Cruz up 9 in Texas MORE.

Obama will also travel to Philadelphia on Friday to rally with Democratic Sen. Bob CaseyRobert (Bob) Patrick CaseyDems target small cluster of states in battle for House Overnight Health Care — Presented by Purdue Pharma — Trump officials move to require drug prices in TV ads | 4,000 more people lose Medicaid in Arkansas | New top official for Medicaid Election Countdown: Cruz, O'Rourke fight at pivotal point | Ryan hitting the trail for vulnerable Republicans | Poll shows Biden leading Dem 2020 field | Arizona Senate debate tonight MORE and Gov. Tim Wolf (D).

Obama had previously avoided the campaign trail since leaving office, wary of nationalizing tight state races or rallying GOP voters in some areas.

Trump's comments came during a rally in Nevada on behalf of Sen. Dean HellerDean Arthur HellerDemocrats slide in battle for Senate Biden: American values being 'shredded' under Trump Trump says Heller won lone Nevada Senate debate: 'He beat her very badly' MORE (R-Nev.), one of the most vulnerable Republicans running for reelection in November.