No matter what a federal judge rules, Sen. Ron Johnson, R-Wis., told Newsmax on Thursday he is opposed to birthright citizenship.

"I think birthright citizenship is ridiculous. We're one of the few nations that allow it," Johnson said on "Rob Schmitt Tonight."

A federal judge on Thursday temporarily blocked President Donald Trump's executive order ending the constitutional guarantee of birthright citizenship regardless of the parents' immigration status.

According to Reuters, Trump quickly responded by saying his administration will appeal the decision, a cornerstone of his planned efforts to rein in illegal immigration.

U.S. District Judge John C. Coughenour, a Ronald Reagan appointee, ruled in the case brought by the states of Washington, Arizona, Illinois and Oregon, which argue the 14th Amendment and Supreme Court case law have cemented birthright citizenship.

Johnson said conservative judges always apply the law as they read it.

"They're not out to alter the law," Johnson said. "This is the way he reads the law. So he's going to apply it. He's not going to alter it for his own political preference. This will have to work its way through the courts."

Johnson said the case could end up before the Supreme Court.

"If in the end, the Supreme Court rules, no, that's what the 14th Amendment says, we have to adhere to it and tell Congress and the American people to ratify a new constitutional amendment," Johnson said. "This will be adjudicated through the courts. That was really the purpose of the executive order, to start the adjudication of this through the courts, and in the end, we'll get a final ruling on this and we'll determine if we want to change that again."

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