Sen. Rand Paul, R-Ky., on Tuesday used the Supreme Court's birthright citizenship ruling to renew his call for a constitutional amendment to end the policy, with several Republican Senate colleagues joining his effort.

"Upset with the SCOTUS decision today?" Paul wrote on X. "Call your senator at (202) 224-3121 and tell them to support my Constitutional Amendment to end Birthright Citizenship. We must protect the integrity of American citizenship."

Paul first unveiled the proposed constitutional amendment on X in April, saying automatic citizenship for anyone born on U.S. soil "is wrong and not at all the intent of those who wrote the 14th Amendment."

He said the amendment would limit automatic citizenship to children born to U.S. citizens, lawful permanent residents, or certain members of the U.S. military serving legally in the country.

Paul's push gained support Tuesday from several Senate Republicans following the Supreme Court's decision rejecting President Donald Trump's executive order restricting birthright citizenship.

Sen. Mike Lee, R-Utah, declared on X that "the long fight for a constitutional amendment begins now."

"We must explicitly exclude foreign nationals who break our laws, violate our borders, or exploit loopholes to make their families American citizens," Lee wrote, arguing the court's ruling upheld "cheap and cheated citizenship."

Sen. Bernie Moreno, R-Ohio, also called for congressional action.

"The Supreme Court ignored the 14th Amendment and handed a win to the CCP," Moreno wrote. "Congress needs to act now."

Sen. Rick Scott, R-Fla., said lawmakers should respond by closing what he called loopholes in the immigration system.

"The Supreme Court has made its decision, now Congress needs to respond," Scott wrote, urging passage of his SAFE KIDS Act, which he said targets the exploitation of U.S. surrogacy laws for birthright citizenship.

Scott also called on Congress to codify Trump's border policies "so a future Democrat administration can't undo them."

Florida Republican Gov. Ron DeSantis likewise argued that the ruling leaves constitutional change as the primary path forward.

"This was not a decision on procedural grounds," DeSantis wrote on X. "Will need either a constitutional amendment or a future court to overrule this. Anyway you slice it, the decision is a major defeat."

The Supreme Court ruled that the 14th Amendment's Citizenship Clause protects birthright citizenship for nearly everyone born in the United States, rejecting President Donald Trump's executive order that would have denied citizenship to many children born to parents who are in the country illegally or temporarily.

The majority relied on longstanding interpretations of the 14th Amendment and the court's 1898 United States v. Wong Kim Ark precedent, according to The Associated Press.

Trump signed the executive order on his first day back in office as part of his broader immigration agenda, arguing that children of people in the country unlawfully are not "subject to the jurisdiction" of the United States within the meaning of the 14th Amendment.

Lower courts had blocked the order before the Supreme Court affirmed those rulings.

While the court's ruling leaves Trump's executive action invalid, Paul and several Republican lawmakers say the issue now belongs in Congress and, ultimately, before the states through the constitutional amendment process.

Under Article V of the Constitution, an amendment requires approval by two-thirds of both chambers of Congress and ratification by three-fourths of the states.