US President Donald Trump has denied reaching a deal with top Democrats to protect young undocumented migrants.
Mr Trump said “massive border security would have to be agreed in exchange for consent” on the immigrant programme.
Top Congress Democrats Nancy Pelosi and Chuck Schumer announced the agreement on the migrants, known as Dreamers, after talks with Mr Trump on Wednesday.
They said the plan excluded the president’s proposed wall with Mexico. Mr Trump said the wall would be built.
The Deferred Action for Childhood Arrivals (Daca) programme protects some 800,000 people in the US, and also provides temporary permits for work and study.
The Obama-era Daca scheme was put in place to protect so-called “Dreamers” – migrants brought to the US illegally as children – from deportation.
Mr Trump announced on 4 September he would cancel the scheme, while giving Congress six months to enact a replacement plan for Daca recipients.
On Thursday morning he repeated that he was in favour of regulating their status.