President TrumpDonald John TrumpJoaquín Castro: Trump would be 'in court right now' if he weren't the president or 'privileged' Trump flubs speech location at criminal justice conference Comey reveals new details on Russia probe during House testimony 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 ClintonComey reveals new details on Russia probe during House testimony Clinton among VIPS attending pre-wedding celebrations for daughter of India’s richest man Comey’s confession: dossier not verified before, or after, FISA warrant 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 CordrayPut 'regulation by enforcement' where it belongs: The trash Exclusive: Consumer bureau name change could cost firms 0 million Kasich to return to New Hampshire for post-midterms visit MORE.

Obama will also travel to Philadelphia on Friday to rally with Democratic Sen. Bob CaseyRobert (Bob) Patrick CaseyWould-be 2020 Dem candidates head for the exits O’Rourke, Brown shake up volatile Democratic horse race The Hill's Morning Report — Presented by T-Mobile — Democratic race for Speaker turns nasty 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 HellerWhite House jumps into fight over energy subsidies One last fight for Sen. Orrin Hatch Trump threatens to cut federal incentives for GM’s electric cars MORE (R-Nev.), one of the most vulnerable Republicans running for reelection in November.