Trump on Super Tuesday 2018: 'So much for the big Blue Wave'

President TrumpDonald John TrumpBusiness, ballots and battling opioids: Why the Universal Postal Union benefits the US Sanders supporters cry foul over Working Families endorsement of Warren California poll: Biden, Sanders lead Democratic field; Harris takes fifth MORE in a tweet early Wednesday claimed victory after Republicans secured spots in major California races this November.

In a tweet, the president mocked reports of Democratic Party strength heading into the midterm elections, predicting a "Red Wave" of GOP victories instead.

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"Great night for Republicans! Congratulations to John Cox on a really big number in California. He can win. Even Fake News CNN said the Trump impact was really big, much bigger than they ever thought possible. So much for the big Blue Wave, it may be a big Red Wave. Working hard!" Trump tweeted.

Trump's tweet comes hours after businessman John Cox (R) secured a runoff slot against Lt. Gov. Gavin Newsom (D) in Tuesday's primary. 

Republicans also locked Democrats out of at least one House race, in Rep. Paul CookPaul Joseph CookHillicon Valley: DOJ approves T-Mobile-Sprint merger | Trump targets Google, Apple | Privacy groups seek to intervene in Facebook settlement | Democrats seize on Mueller hearings in election security push Republican lawmakers issue dueling letters over Pentagon 'war cloud' contract Native American groups press Congress to rescind Wounded Knee medals MORE's (R) district, and the plethora of GOP candidates remaining on the ballot for November could mean a higher turnout among Republican voters in the state later this year.

Democrats secured their own victories Tuesday night, however, scoring at least second-place finishes in every race they targeted.

California is home to 10 of the most competitive House races this November, as Democrats try to overcome a 23-seat deficit and retake control of the lower chamber. The latest CBS News–YouGov Battleground Tracker shows the Democrats with a slight advantage over Republicans currently for control of the House, well within the poll's margin of error.

Updated at 10:34 a.m.