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GOP strategist: 'Trump has made the Democratic Party great again'

Republican strategist Alex Castellanos on Sunday said the Democratic Party has flourished under President TrumpDonald John TrumpFive takeaways from Cruz, O'Rourke's debate showdown Arpaio files libel suit against New York Times IMF's Christine Lagarde delays trip to Middle East MORE's presidency, pointing to the party's sweeping election wins on Tuesday.

“Donald Trump has made the Democratic Party great again,” Castellanos said on ABC's "This Week."

“He’s unified it and given it intensity at the polls much like President Barack ObamaBarack Hussein ObamaGOP group makes late play in Iowa seat once seen as lost Chance the Rapper works as Lyft driver to raise money for Chicago schools Americans are safer from terrorism, but new threats are arising MORE unified and intensified the Republican party,” he said during a roundtable discussion.

Castellanos predicted that Trump being in office will continue to negatively impact the Republican Party's efforts to protect and win seats in the upcoming 2018 midterm elections.

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“If you look ahead at 2018 — those Republican districts that Hillary ClintonHillary Diane Rodham ClintonBudowsky: Closing message for Democrats Election Countdown: Dems outraise GOP in final stretch | 2018 midterms already most expensive in history | What to watch in second Cruz-O'Rourke debate | Trump raises 0M for reelection | Why Dems fear Avenatti's approach GOP mocks Clinton after minor vehicle collision outside Mendendez campaign event MORE won, 23 of them — the House is in play,” Castellanos said.

His remarks come after Democrats won elections from coast to coast on Tuesday, including the two gubernatorial races in Virginia and New Jersey.

Virginia Democrat Ralph Northam easily won his race over Republican Ed Gillespie, invigorating a party that had been largely cautious in the lead-up to the election.

Castellanos said Gillespie still lost after he successfully "got out the Trump vote" because he lost support of women in the suburbs, which underwent what he called a “feminist surge.”