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 TrumpShocking summit with Putin caps off Trump’s turbulent Europe trip GOP lambasts Trump over performance in Helsinki Trump stuns the world at Putin summit 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 ObamaWhy did it take so long for Trump to drain the swamp of Pruitt? President Trump is tougher on Russia in 18 months than Obama in eight years Obama in Kenya for launch of sister’s sports center 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 ClintonShocking summit with Putin caps off Trump’s turbulent Europe trip GOP lambasts Trump over performance in Helsinki Trump stuns the world at Putin summit 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.”