President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests 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.

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! — Donald J. Trump (@realDonaldTrump) June 6, 2018

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 Cook Paul Joseph CookLawmakers seek extension for tribes to spend stimulus money following Treasury delays The 14 other key races to watch on Super Tuesday Republicans eye top spot on Natural Resources panel 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.