WASHINGTON — With congressional elections a week away, President Trump  said on Tuesday that he’ll seek to scrap the right of citizenship for U.S.-born children of non-citizens and illegal immigrants as he tries again to dramatically reshape immigration policies.

Reviving his support for a legally questionable theory, Trump told the Axios news website he would issue an executive order on so-called birthright citizenship, an issue that has long rankled some conservative Republicans.

Trump’s previous calls to end the practice have resonated with his political base, but moderate Republicans and some legal experts say Trump is running afoul of the U.S. Constitution.

Under the Constitution’s 14th Amendment, enacted in the wake of the Civil War to ensure that Black Americans previously subject to slavery had full citizenship rights, citizenship is granted to “all persons born or naturalized in the United States.”

It has been routinely interpreted over the years to confer citizenship to people born in the United States whose parents are illegal immigrants.

Trump, who has made rhetoric against illegal immigrants a central plank of his presidency, originally spoke out against birthright citizenship when he first started running for president in 2015.

One Republican member of Congress, frequent Trump ally Senator Lindsey Graham, said he would move to introduce legislation “along the same lines” as Trump’s order.

Neither Graham nor Trump gave any details about the latest plan. The White House did not respond to a request for comment.

Other Republicans were critical. U.S. House of Representatives Speaker Paul Ryan said Trump could not scrap the right with the stroke of a pen.

“You cannot end birthright citizenship with an executive order,” Ryan, the top Republican in Congress, said in an interview with radio station WVLK, the Washington Post reported.

In the run-up to the Nov. 6 congressional elections, Trump has seized on a caravan of migrants from Central America who are trekking through Mexico toward the United States, calling the migrants a threat. On Monday, the United States said it would send more than 5,200 troops to help secure the border with Mexico.

Bill Kristol, editor at large of the conservative Weekly Standard and a Trump critic, said in a Twitter post:

“The shrinking caravan of refugees isn’t a threat to the country or the Constitutional order. A president who tries to end birthright citizenship by executive order is.”

Trump, whose hard-line stance against illegal immigration helped him win the White House, is emphasizing his policy to drum up support for fellow Republicans in the elections as Americans are sharply divided and grappling with race and national identity.

Opinion polls show Democrats have a chance at achieving the net gain of 23 seats they need to win a majority in the House, but they have a longer shot at the Senate, where they need a gain of two seats.

Democratic House Leader Nancy Pelosi accused Trump of trying to distract attention from health care policy, which Democrats have identified as a top election issue.

“President Trump’s new claim he can unilaterally end the Constitution’s guarantee of citizenship shows Republicans’ spiraling desperation to distract from their assault on Medicare, Medicaid and people with pre-existing conditions,” Pelosi said in a statement.