Republicans swiftly rejected President Joe Biden‘s latest executive action on immigration as an “amnesty” that will drive new waves of illegal border crossings.

On Tuesday, the White House announced legal protections and an easier path to citizenship for illegal immigrants married to U.S. citizens, a policy that could shield as many as 500,000 migrants from deportation. Spouses will no longer have to return to their home country as part of the green card process, leading to GOP complaints that the Biden administration is “inviting” migrants to come to the country unlawfully.

“Biden’s mass amnesty plan will undoubtedly lead to a greater surge in migrant crime, cost taxpayers millions of dollars they cannot afford, overwhelm public services, and steal Social Security and Medicare benefits from American seniors to fund benefits for illegals,” Karoline Leavitt, a spokeswoman for the Trump campaign, said in a statement on Tuesday.

Former President Donald Trump’s ex-senior adviser for policy, Stephen Miller, even suggested the action was worthy of impeachment.

NumbersUSA, a Washington-based nonprofit group that lobbies for lowering immigration, called the immigration program, which will be rolled out by the end of the summer, unconstitutional while noting the recent surge in border crossings.

Biden issued a separate executive order earlier this month to clamp down on the border, but his latest action is meant to address the concerns of his left flank.

“Rather than stopping the worst border crisis in history, President Biden has overreached his executive authority to use an unconstitutional process, circumventing voters and their elected representatives in Congress, to send a message that amnesty is available to those who enter illegally into the United States,” NumbersUSA CEO James Massa said in a statement to the Washington Examiner. “The action is unconstitutional. The timing is unconscionable.”

Tom Homan, former acting Immigration and Customs Enforcement director, called it another “giveaway program” by the White House and a disregard for parole programs that are intended to be used on a highly selective basis, not at large as in this case.

“They’ve twisted the parole in place,” Homan said, visiting fellow at the conservative Heritage Foundation think tank in Washington, during a call with reporters on Tuesday. “This is nothing but getting votes, not doing the right thing for the American people.”

The White House fact sheet issued on Tuesday stated that spouses must have been in the country for at least 10 years to qualify and, if approved by the Department of Homeland Security, have a three-year window to apply for lawful permanent residency for themselves. An estimated 50,000 children under the age of 21 are also expected to be protected by the order.

Meanwhile, the president expedited the visa process for any foreign-born students, including “Dreamers,” who graduate from U.S. higher education institutions and hold an offer of employment from an American company.

Democrats, including those on the Congressional Hispanic Caucus, cheered the move, but not without some hesitancy, given that it could be undone.

“While there is no substitute for congressional action, and the DACA program hangs in the balance, today’s actions will provide much-needed relief to American families across the country,” CHC Chairwoman Nanette Barragan (D-CA) said in a statement.

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Global Christian humanitarian organization World Relief warned that only lawmakers in Washington would be able to codify the executive action into law and ensure immigrants were guaranteed the protections in the future.

“While we are grateful for this step, this executive action, enacted by one president, could easily be undone by a future president, and may also face legal challenges, so we believe the better solution is for Congress to act in a bipartisan way to address this and other elements of our immigration laws that separate families,” Matthew Soerens, vice president of advocacy and policy for World Relief, said in a statement.