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 TrumpAverage tax refunds down double-digits, IRS data shows White House warns Maduro as Venezuela orders partial closure of border with Colombia Trump administration directs 1,000 more troops to Mexican border 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 Obama4 ways Hillary looms over the 2020 race Obama goes viral after sporting black bomber jacket with '44' on sleeve at basketball game Obama attends UNC-Duke basketball game 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 ClintonDem strategist says Clinton ‘absolutely’ has a role to play in 2020 Left-leaning journalist: Sanders would be 'formidable candidate' against Trump Clinton hits EPA for approval of pesticide dump: ‘We need bees!’ 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.”