U.S. President Donald Trump has signed two new executive orders aimed at tightening restrictions on birthright citizenship, despite a recent Supreme Court ruling that struck down his earlier attempt to limit the policy. 

The executive orders, signed on Thursday, expand the categories of non-citizens whose children would not automatically qualify for U.S. citizenship and introduce new measures targeting so-called “birth tourism”—the practice of travelling to the United States to give birth so a child acquires American citizenship. 

Speaking from the Oval Office, Trump said the measures were long overdue and criticised the Supreme Court’s decision that invalidated his previous executive order.

One of the new directives seeks to deny automatic citizenship to children born in the United States if one parent falls into certain categories, including members of foreign terrorist organisations, foreign government employees or individuals accused of attempting to obtain U.S. citizenship through fraud. The second order directs federal agencies to strengthen efforts against birth tourism. 

Trump said the actions are intended to protect the United States from foreign actors whom his administration believes have exploited the country’s immigration system.

The new executive orders are expected to face legal challenges, with critics arguing they conflict with constitutional protections reaffirmed by the Supreme Court in June.