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 TrumpHouse Democrat slams Donald Trump Jr. for ‘serious case of amnesia’ after testimony Skier Lindsey Vonn: I don’t want to represent Trump at Olympics Poll: 4 in 10 Republicans think senior Trump advisers had improper dealings with Russia 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 ObamaPatagonia files suit against Trump cuts to Utah monuments Former Dem Tenn. gov to launch Senate bid: report Eighth Franken accuser comes forward as Dems call for resignation 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 ClintonGrassley blasts Democrats over unwillingness to probe Clinton GOP lawmakers cite new allegations of political bias in FBI Top intel Dem: Trump Jr. refused to answer questions about Trump Tower discussions with father 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.”