The Republican senator who introduced President Donald Trump's immigration proposal said it's the president's framework bill or nothing.
Senator Tom Cotton of Arkansas called the bill the best and final offer.
His comments came as Congress work to reach an agreement on extending DACA protections.
That program protects people brought to the United States illegally as children. Those protections are set to expire next month.
The proposal would offer a path to citizenship for dreamers and provide $25 billion for border security and end a visa lottery.
"What I hope we can do is put aside partisan politics here and get to the real issues that 2/3 of Americans want us to solve in the manner the President has laid out today,” said Georgia Senator David Perdue.
Trump is touting the proposal, even as it faces an uphill battle in Congress.
He said Democrats and Republicans must act now to provide legal protections to Dreamers, calling it the last chance.