Steve King: Julian and Joaquin Castro learned Spanish to ‘qualify as retroactive Hispanics’
© Greg Nash

Rep. Steve KingSteven (Steve) Arnold KingSanders, Harris set to criss-cross Iowa Steve King endorses white nationalist mayoral candidate in Canada Julian Castro responds to Steve King 'Hispanic' comments: 'He does what he usually does' MORE (R-Iowa) took to Twitter early Thursday with a controversial claim about Texas Rep. Joaquin CastroJoaquin CastroWhite House responds to Joaquin Castro's Kushner allegations: 'an outrageous slanderous lie' Overnight Defense: US, South Korea cancel another military exercise | Dozen sailors injured in chopper crash on aircraft carrier | Navy vet charged with sending toxic letters Joaquin Castro accuses Kushner of orchestrating killing of Khashoggi MORE (D) and his brother, former Secretary of Housing and Urban Development Julián Castro.

King said the two brothers, who are second-generation Mexican-Americans, took “Spanish lessons to qualify as retroactive Hispanics.”

The GOP lawmaker’s remark came in response to a tweet criticizing Rep. Beto O’ Rourke (D-Texas) for changing his name from Robert Francis O’Rourke. The person who posted the tweet said it as “another example of just how Democrats get when the actual Latino in the race (Ted CruzRafael (Ted) Edward CruzElection Countdown: Small-donor donations explode | Russian woman charged with midterm interference | Takeaways from North Dakota Senate debate | O'Rourke gives 'definitive no' to 2020 run | Dems hope Latino voters turn Arizona blue White vote is 'fundamental problem' for Texas Dems, political analysts says Houston Chronicle endorses Beto O'Rourke in Texas Senate race MORE) stands against everything they stand for.” 

The Castro brothers will reportedly join O'Rourke at stops along the Texas border as he seeks to unseat Sen. Ted Cruz (R) in the Texas Senate race. 

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Julián Castro will also be joining former professional baseball player J.D. Scholten at two events in Iowa this weekend. Scholten is vying to unseat King in Iowa's 4th Congressional District in November's midterm election, Scholten's campaign confirmed to The Hill.

King has a history of making of making controversial claims on social media.

Late last year, King received widespread criticism for saying diversity is not America's strength.

Earlier this summer, King also prompted backlash for retweeting a message from Mark Collett, the former chairman of the youth division of the British National Party (BNP).

At the time, he said his retweeting of the prominent far-right British activist who has described himself as a "Nazi sympathizer” was “unintentional,” but wouldn’t say he was sorry for sharing the tweet.

-- Updated 6:20 p.m.